Abstract
The Strait of Malacca is one of the world’s most strategically important maritime chokepoints and influences the power exerted by Indonesia, Malaysia and Singapore beyond their conventional capabilities. This paper examines the extent of how the strait’s geographical and economic importance, security capacity, external assistance and relationships with major powers contribute to this influence, while also considering the limits created by international law, external dependence and alternative routes.
1. Introduction
The Strait of Malacca demonstrates how geography can translate into considerable geopolitical influence. As a vital maritime chokepoint connecting the Indian Ocean and the Pacific, its position is essential to global trade; in 2024, over $2.4 trillion worth of goods transited the strait, which is equivalent to approximately 21% of global maritime trade and 10% of total global trade (Yeung & Fok, 2025). Therefore, its importance to the economies of major Asian powers, such as China and India, gives Southeast Asian states surrounding the strait, such as Singapore and Malaysia, influence that may exceed what their conventional measures of power would suggest. Beyond commercial trade, its position also facilitates the movement of naval assets, which gives it significant importance for regional security. The establishment of the Malacca Straits Patrol in 2004 by Singapore, Malaysia and Indonesia, later joined by Thailand, demonstrates how the states have converted their geographical position into institutionalised security influence (Ministry of Defence Singapore, 2015). Through coordinated maritime patrols and the “Eyes-in-the-Sky” aerial surveillance initiative, the states established themselves as the strait’s primary custodians of security (Ong-Webb & Ho, 2005). Indeed, after introducing these measures, Lloyd’s Joint War Committee removed the Malacca Strait from its war-risk classification in August 2006. Although geography alone does not guarantee power, as geopolitical influence also depends heavily on a state’s ability to convert this endowment into advantage, the strait nevertheless gives these states an important asset to leverage geopolitical and geoeconomic power and therefore creates a disproportionate advantage. This investigation will examine the extent to which the Strait of Malacca allows the Southeast Asian littoral states to gain geopolitical influence through economic leverage, maritime security, diplomacy and their relations with competing global powers.
2. What is the Strait of Malacca?
The Strait of Malacca is a major maritime Sea Line of Communication (SLOC) that connects the Andaman Sea (Indian Ocean) and the South China Sea (Pacific Ocean). It lies between the island of Sumatra (Indonesia) and the Malaysian peninsula. The Malacca Strait is 500 miles (800 km) long. It is funnel-shaped and 40 miles (65 km) wide. The strait gets its name from the trading post of Melaka (formerly known as Malacca), which was highly important in the 16th and 17th centuries.
2.1 China’s Evolution in Global Production
The Strait of Malacca links the Indian Ocean’s largest reserves of hydrocarbons in countries such as India, Iran and Saudi Arabia to the largest importer of energy in the world: China. Today, the strait plays a pivotal role in the supply chain that helps fuel carbon-capitalist economies. Of the 100+ million barrels of crude oil and petroleum products moving by sea every day, about 16% pass through the Strait of Malacca (World Oil Transit Chokepoint, 2017).
2.1.1 WHAT IS THE MALACCA DILEMMA AND ITS EFFECT ON CHINA
China, which imports more than half its oil, gets an estimated 80% of it through the strait (ChinaPower Project, 2019). The dependence on the strait is a major threat to the maritime security of the People’s Republic of China, and this has been acknowledged by political leaders of China, who have coined it as the “Malacca dilemma”. Other routes discussed have been deemed either too difficult for tankers to navigate because they are too shallow (Sunda Strait) or too far to be economically beneficial as a detour (Lombok Strait). The increase in acts of piracy, oil spills and trafficking has led to a disruption of trade within the Strait of Malacca. This “dilemma” may be further highlighted by China’s most recent conflicts with countries such as Vietnam, Taiwan and the Philippines, all of which have sea access to the South China Sea. To bypass these conflicts, China has begun to develop ties with neighbouring nations such as Myanmar and Pakistan. These nations allow China to avoid the Strait of Malacca and the South China Sea by building the Kyaukpyu deep-sea port (Myanmar), an early step toward establishing the Belt and Road Initiative (BRI). Meanwhile, the China-Pakistan Economic Corridor (CPEC) is the flagship project of the Belt and Road Initiative.
2.2 How the Singapore and Malacca Straits Act like Chokepoints
The Singapore Strait is a channel that extends for 65 miles (105 km) between the Malacca Strait to the west and the South China Sea to the east. The strait is 10 miles (16 km) wide and lies between the island of Singapore to the north and the Riau Islands to the south, which are part of Indonesia. It includes part of the Johor Strait and Keppel Harbour, as well as small islands. As a deepwater approach to the port of Singapore, the Singapore Strait is one of the world’s busiest commercial routes (Britannica, 2024). Both the Malacca Strait and Singapore Strait hold one of the most important shipping routes on Earth from both a strategic and an economic perspective. Around 200 vessels pass through the straits each day. These vessels transport one-third of the world’s traded goods such as Chinese manufactured goods, Indonesian coffee and much more (Qu & Meng, 2012).
There are major and minor disasters that could be caused by the Straits’ shallowness as well as their narrowness. If an incident involves an oil tanker, such as the one that happened near Port Dickson on 19th August 2009 and the Changi terminal on 30th May 2010 (Qu & Meng, 2008), these incidents might lead to the strait being closed, or even partially closed, for the clean-up of the oil spill. If the straits are ever closed, the impact that it would have on the global stage would be unmatched. As Chinese manufactured goods, Indonesian coffee and much more are transported across the straits per day, if the straits closed, these goods would never reach their destination. China does have other ways to get around the Strait of Malacca, but these routes are either too long or too narrow for bigger oil tanks to pass through. The effects would also impact families, as there would be rising prices as the supply decreases, a lack of essential medicine from more undeveloped nations and the closure of businesses as the financial burden would increase. All of these and much more would occur if the Strait of Malacca were ever closed.
2.3 What are the Littoral Nations and Their Role?
The Strait of Malacca, unlike the Suez or Panama Canal, is not a man-made waterway which is controlled by a single government. Instead, it is overseen by three governments which jointly share the responsibility of making sure the strait is safe and easy to navigate.
This is called a legal regime, which is a complete set of rules, laws and guidelines that manage a specific topic/activity. It sets clear duties, rights and punishments for a certain area. This legal regime is governed by a 1982 convention called the United Nations Convention on the Law of the Sea (UNCLOS); it was ratified by Indonesia, Malaysia and Singapore. Under the UNCLOS, the strait is meant to follow the principles of transit passage, which ensures all vessels from any nation have the right to navigate without coastal nations having the control to suspend transit, deny access and/or impose a toll. Since the 1970s, all three nations have gradually strengthened cooperation in terms of maritime security, coordinating patrols around the strait, anti-piracy operations and managing traffic. This framework has allowed the Strait of Malacca to avoid disruptions in trade compared to other major chokepoints such as the Strait of Hormuz. The role of geography also helped as it divided up control of the strait among the three nations and made sure no one controlled all of it. This should not be seen as the three nations having a strategic alignment; they have separate strategic value of the strait.
2.3.1 THE EFFECTS OF THE STRAIT OF MALACCA ON SINGAPORE
This city-state has the most to lose from any disruption that is caused to the strait. The state’s economy is built on the economic success of its role as Southeast Asia’s premier logistics and financial hub. The Port of Singapore — the second busiest container port in the world — serves as the main transshipping hub of goods that link the Indian and Pacific Oceans. If there is any prolonged delay to the traffic, this would strike the foundations of Singapore’s economy.
2.3.2 THE ROLE OF THE STRAIT OF MALACCA ON MALAYSIA AND INDONESIA
Malaysia has similar roles towards the stability of the Strait of Malacca as it is crucial to preserve the competitiveness of the Port of Klang, which is one of the region’s largest maritime gateways. On the other hand, Indonesia plays a complex strategic position. As it regulates a significant portion of Malacca’s coastline, Jakarta also exerts sovereignty over both the Sunda and the Lombok Straits — which are used as the main alternative routes if the Strait of Malacca is ever to be disrupted. This helps in giving Indonesia an exceptional geopolitical advantage: it is the only littoral state which has the capabilities to influence not only the principal maritime corridor but also its primary alternatives.
3. A History of Malaccan Affairs
The Strait of Malacca evolved historically through distinct phases of governance and economic control. In the pre-colonial period, indigenous maritime kingdoms utilised flexible regional networks and naval authority to manage regional trade routes and collect harbour docking and transit duties (Wolters, 1999; Hall, 2011). It later became a militarised mercantilist monopoly, first designed cartographically and legally through territorial enclosurement and later through Westphalian structures to command global prices via end-to-end supply chain monopolisation: ie., imperial exclusion of markets for the Portuguese, Dutch and British imperial powers during the colonial period from the early 16th century (Hall, 1992).
3.1 Pre-colonial Affairs
Pre-colonial governance dynamics in the Strait of Malacca can be viewed as the rise and fall of two successive indigenous hegemonic empires: the Srivijayan Empire (7th-13th centuries) and the Malacca Sultanate, which ruled from 1400 until the Portuguese colonisation of the region in 1511. The Srivijayan Empire lay along the river basins of present-day southeastern Sumatra and commanded both the Strait of Malacca and the Sunda Strait. As an entrepôt economy, it warehoused goods, extracted tolls and forced East-West maritime traffic to clear customs at its port by coercively blocking rival ports. Srivijaya had established itself as one of the most prosperous thalassocracies of the pre-modern world. At its peak, Srivijaya justified domestic legitimacy by becoming a premier global hub for Buddhism and external legitimacy by securing imperial tributary protection from the Tang and Song dynasties of China, which deterred aggressive regional rivals. At this time, Srivijaya was both the imperial China-favoured maritime gateway for East-West-bound trade and the most predatory extortionist chokepoint (Hall, 2011; Sen, 2003), which ultimately contributed to the empire’s downfall.
In 1025 CE, Rajendra Chola I of South India led the earliest documented blue-water trans-oceanic naval operation of medieval history, in punitive response to the extortionist practices to which Tamil merchants under his patronage were falling victim in Song China-bound trade (Kulke, 2009; Sen, 2003). The Chola invasion devastated and plundered Srivijaya, thereby ending its half-a-millennium-long thalassocratic hegemony and establishing unimpeded maritime transit access for Tamil and Arab traders. The declining Srivijayan Empire created a regional power vacuum, causing the same transactional network units Srivijaya used to fragment into sovereign rivals with independent missions to China, and shifting the centre of power from Palembang to Jambi by the late 11th century (Wolters, 1999; Hall, 2011). This was followed by a transitional phase of regional thalassocratic competition and conquest by the Javanese and Siamese Empires over the remaining Sumatran Empires until Prince Parameswara founded the Malacca Sultanate in 1400, argued to be the functional, cultural and economic successor of the Srivijayan Empire (Wolters, 1999). The sultanate adopted Islam, secured diplomatic relations with the Ming Dynasty of China, modernised foreign trade administration and codified maritime laws (Wade, 2005; Reid, 1993), which made it comparable to contemporary Venice, Alexandria and the Hanseatic League. The Malacca Sultanate became more prosperous than Srivijaya because of its modernised administrative systems, even though it lacked Srivijaya’s vast natural resources and commanded only the Strait of Malacca, whereas Srivijaya also controlled the Sunda Strait. The Portuguese conquest of the Malacca Sultanate in 1511 cast a colonial shadow over Southeast Asia, consolidating the post-industrial revolution after the arrival of the Dutch and the British (Andaya, 1992; Boxer, 1969).
3.2 Colonial Affairs
The Portuguese conquest of Malacca (1511-1641) marked the beginning of a new phase in which the strait was deliberately exploited as an instrument of imperial economic power. Following the fall of the Malacca Sultanate, the Portuguese sought to monopolise the entrepôt’s commercial position by transforming Malacca into a fortified trading centre from which they could regulate the movement of goods (Lopes, 2025; Sar Desai, 2009). The scale of this commerce was substantial, as it is estimated that the annual value of Malacca’s textile trade alone was 460,000 cruzados, which is equivalent to almost 20 tonnes of silver (National Heritage Board, Singapore, n.d.). Therefore, the Famosa fortress was constructed, and customs duties and trading restrictions were imposed to secure their position in the Strait. Nevertheless, the surrounding merchant communities such as the Malay and Acehnese polities were able to channel their goods by exploiting alternative maritime routes; Aceh in particular emerged as a major rival to Portuguese Malacca, while Johor developed into another important entrepôt following the decline of the Malacca Sultanate. Consequently, this highlights that control of a maritime chokepoint does not necessarily equate to control surrounding the chokepoint, since merchants can redirect commerce to avoid costly customs duties, ranging from 3% to 9% on ships passing Malacca, including ships that did not unload or sell their goods there (Cardon pp. 176-177, 1934, citing Hunter, 1903).
The Dutch VOC inherited Malacca after defeating the Portuguese in 1641, but its objective differed from the Portuguese attempt to monopolise the entrepôt (Arasaratnam, 2009). With the assistance of Johor, following a VOC-Johor alliance established in 1606, the Dutch successfully captured Malacca and therefore incorporated it into a defensive barrier centred on Batavia, modern-day Jakarta (Khan, 2010; International Court of Justice, 2005). Rather than making Malacca the primary centre of Dutch commerce, the VOC made it a stronghold; the VOC’s own historical account says that Batavia became the central rendezvous in 1619. Therefore, Johor secured commercial privileges and political protection through this relationship with the VOC, contributing significantly to the sultanate’s prosperity. This demonstrates that although European colonial dominance meant that the surrounding states could not exercise full control on the strait, they could use their own geographical position to offer support and thus leverage in exchange for trade privileges and political protection.
The British Period from 1824 to 1957 represented a major change in the way the strait was used economically. As a result of the Anglo-Dutch Treaty of 1824, which divided up the areas of influence between the British and the Dutch, the Dutch agreed not to set up settlements on the Malay Peninsula, thus enabling Britain to strengthen its position in the region. The empire developed the Straits Settlements of Penang, Malacca and Singapore, which were formally established in 1826 (International Court of Justice, 2005). Unlike the Portuguese emphasis on commercial monopoly or the Dutch emphasis on strategic control, British policy increasingly centred on maintaining Malacca as a low-tariff, open-access commercial route. This is evident in the British commercial policy in Singapore, since the country had been made into a free port in 1819, a move which attracted the British owing to its relatively unrestricted trading conditions (Chong, 2024). The commercial results were important, as indicated by the rise from £4.04 million in 1825 to £7.72 million in 1850 (Winstedt, 1935). The British therefore demonstrated that the economic value of a maritime chokepoint could be enhanced not through a monopoly, but through relatively open access, which allowed the strait to function as a platform for an increasingly integrated transnational trading network.
The contrasting colonial experiences provide an important historical precedent for understanding the strait’s contemporary geopolitical influence. These different approaches from different colonial powers suggest that geography alone does not determine the political or economic value of a chokepoint but rather the manner in which the states govern it that makes the strait effective and of more value. This is relevant to the post-colonial period, as the later emphasis of ASEAN states to open regionalism can be understood not just the set principles of international law, but as a continuation from a longer historical recognition that maintaining open access can generate greater collective prosperity.
3.3 Postcolonial and Cold War Affairs
The end of European colonial rule shifted the Strait of Malacca’s political significance from an imperial possession to an asset of the newly independent Southeast Asian states. After the independence of Indonesia and Malaya, as well as Singapore’s separation from Malaysia in 1965, the principle was explicitly articulated that the strait should remain freely accessible to all nations rather than become subject to great-power rivalry (Hansard, 1972). Therefore, the “responsibility (of the strait) is shared among littoral states” (Loong, 2005), and “maritime security in the Straits lies with the littoral states” (United Nations, 2005), reflecting an established post-colonial consensus for regional rather than great-power management of the waterway. The Cold War exemplifies its significance further as the Strait is “between the Pacific and Indian Oceans” (Joint Chiefs of Staff, 1967), making it fundamentally important to the containment of communism and, therefore, the security of Western-aligned economies in East and Southeast Asia. This suggests its significance was no longer simply commercial, as the strait had become intertwined with the movement of military forces. This shows a wider post-colonial problem since the states of Southeast Asia aim to keep their sovereignty while remaining economically dependent on an international trading system whose security is increasingly influenced by outside powers. ASEAN was set up in 1967 as an institutional response to this problem, allowing countries in the region to work together to secure collective stability instead of joining the opposing Cold War blocs. This was formalised in the 1971 Kuala Lumpur Declaration, in which the ASEAN members sought to make Southeast Asia a “Zone of Peace, Freedom and Neutrality” (ASEAN, 1971), giving Southeast Asia freedom from interference by outside powers and reinforcing its sovereignty. Consequently, the post-colonial and Cold War period represented a transformation in the relationship between geography and geopolitical power as although the strait remained strategically indispensable to other powers, the end of colonialism enabled its littoral states to convert their geographical advantage into a new form of diplomatic leverage, as it allowed relatively small states to exercise influence disproportionate to their conventional measures of economic and military power.
3.4 Post-Cold War affairs and the Rise of China
The collapse of the Cold War reshaped the circumstances around the Strait of Malacca, as the breakdown of the bipolar world order coincided with East and Southeast Asia’s rapid integration into a more globalised trading system. What had previously been primarily used in the conflict between the United States and the Soviet Union became an increasingly significant chokepoint in an increasingly multipolar Indo-Pacific (Qiao-Franco, Karmazin & Kolmaš, 2025; Suzuki, 2020). This shift is especially evident for China. Its rapid industrialisation made its economy increasingly reliant on sea routes and more susceptible to the strait’s geographical constraints. In 2024, $963 billion of China’s trade went through the Malacca Strait, amounts equivalent to 21% of its imports and 14% of its exports, demonstrating that the strait is deeply embedded in China’s economic structure (Hart et al., 2026). Its importance is further emphasised in China’s energy security, with records showing 22.5 million barrels of petroleum and petroleum products being passed through the strait per day in 2024 (U.S. Energy Information Administration, 2024). This vulnerability was articulated by the former Chinese President Hu Jintao in 2003, and became known as the “Malacca Dilemma”, referring to the concern that China’s dependence on a maritime chokepoint outside its sovereign control could threaten its economic security (Lanteigne, 2008; U.S.-China Economic and Security Review Commission, 2009).
This paradoxical relationship with the strait pressured Beijing to mitigate this structural vulnerability by diversifying energy routes across the Indian Ocean and Eurasia (Choudhary, 2023). For instance, the natural gas pipelines linking China’s southwestern provinces with Myanmar decrease China’s dependence on shipments via the Strait of Malacca (Topçu, 2020), while the wider Belt and Road Initiative has increased Chinese economic links throughout the Indian Ocean and Southeast Asia (Ali, 2020). Nevertheless, the strait’s importance should not be understated, as though alternative routes provide China with options in the event of intervention, they are generally less efficient and can heighten the costs and time on maritime trade (Hart et al., 2026). The strait therefore becomes significant as it highlights a potential weakness in China’s national-security assessments, as it is a strategic area where the interests of major powers intersect, in which the United States could exploit during major conflict (Cordesman, 2021; Cooper, 2018). Thus, great powers now aim not only to control chokepoints but also to reduce their exposure to them. For the Southeast Asian littoral states, this creates a particularly significant form of structural leverage, because major powers have an active interest in maintaining stable relations with the states that exercise sovereign authority over a strategically indispensable chokepoint.
3.5 Theoretical explanation
The diplomatic and strategic manoeuvres in and around the Strait of Malacca have historically been the operationalisation and manifestation of classical paradigms of international relations, their counter-theories and inherited structural imperatives of statecraft.
3.5.1 CLASSICAL LENS: MAHAN, SPYKMAN AND CHOKEPOINT PRIMACY
At the foundational level, the contestation of states over the control and command over the Strait of Malacca draws its rationale from the Mahanian doctrine or the theory of sea power, which tethers national power to the physical capacity to control and command SLOCs and mercantile transit (Mahan, 1890). Concurrently, the Rimland Theory of Spykman identifies the Strait of Malacca as a global maritime pivot, classifying it into a broader grouping, the Asiatic Mediterranean, along with the South and East China Seas. It explains the Strait of Malacca as the key to the Eastern Rimland (Spykman, 1944), which defines rule over Eastern Eurasia as a manifestation of Mackinder’s Heartland Theory (Mackinder, 1919). External engagement in the region, from colonial hegemony to post-Cold War US focus on the Pacific and its FONOPs, are empirical justification of Spykman’s maxim, “…maritime powers must project power along the Rimland to prevent a single continental hegemon from enclosing maritime transit” (Spykman, 1944).
3.5.2 NEOREALISM, OFFENSIVE REALISM AND THE ASIAN MONROE
The anarchic distribution of power in structural realism generates acute security dilemmas (Waltz, 1979). Mearsheimer’s offensive realism directly explains China’s strategic perception of the “Malacca Dilemma” and the same induces it to pursue an Asian iteration of the American Monroe Doctrine (Mearsheimer, 2001). The Chinese BRI is its adventurism in creating theoretical conditions that reject Spykman’s assertion on Rimland vulnerability in favour of a land-based approach to Mackinder’s Heartland wherever the Asiatic Mediterranean leads to its containment, pushing external Western naval supremacy from the First Island Chain, through A2/AD, grey zone-assertions, and dual-use port infrastructure and economic cooperation with prospective states for the cartographic wonder. The US further balances this asymmetry of power through deterrence and defence technology cooperation with the littoral states of Southeast Asia, turning the region into a contested frontier of great-power balancing.
3.5.3 NEOLIBERAL INSTITUTIONALISM AND COMPLEX INTERDEPENDENCE
Interestingly, the purely realist lens fails to explain the relative absence of militarised conflict across the strait, wherein neoliberalism gains its voice. Keohane and Nye’s theory of complex interdependence establishes that reciprocal, multilateral vulnerabilities constrain great-power aggression and kinetic friction among them and their proxies (Keohane & Nye, 1977). The widespread neoliberal interdependence over the Strait of Malacca turns it into a mutual hostage mechanism deterring kinetic adventurism. It also explains the strategic hedging practiced by the littoral states of Southeast Asia and the ASEAN bloc, and their approach to the formalisation of normative constraints to unilateral coercion, sustaining multipolarity (Acharya, 2014; Kuik, 2016). The states also reject the strict realist dichotomy of balancing and bandwagoning in preserving individual sovereignty of actions.
Ultimately, the operational reality of the Strait of Malacca transcends any single international relations theory or approach, and the littoral states have navigated through the polarising trends with self-determination on the basis of its national interests since post-Cold War.
4. External Assistance and Security Capacity: Converting the Strait’s Strategic Importance into Geopolitical Influence
The geographical location of the Strait of Malacca gives Indonesia, Malaysia and Singapore a degree of geopolitical influence that exceeds their conventional power. This influence is disproportionate because the strategic consequences of decisions taken by these states are considerably greater than their conventional military capabilities would normally imply. However, this influence does not arise solely from geographical factors. A strategically located littoral state gains meaningful geopolitical leverage only when it possesses the capacity to protect its surrounding maritime domain, respond to threats and manage the interests of external powers that depend upon it. External assistance has therefore played a dual role: strengthening the security capabilities of the littoral states, allowing them to convert geographical leverage into practical geopolitical influence, while also increasing the involvement of major powers within the region. The extent of this influence consequently depends on whether external resources reinforce Southeast Asian strategic autonomy or create dependence upon stronger states.
4.1 Security Capacity: Converting the Strait’s Geographical Importance into Geopolitical Influence
The strait’s importance to global maritime trade is central to its geopolitical influence. The United States Energy Information Administration recorded approximately 23.2 million barrels of oil per day passing through the strait in the first half of 2025, making it one of the world’s most significant maritime energy chokepoints (US Energy Information Administration, 2026). This creates significant supply chain vulnerabilities for Asian economies, including China, which relies heavily on maritime energy imports.
Nevertheless, geographical importance does not give the littoral states unlimited freedom to use the strait as a political weapon. Under Article 38 of the United Nations Convention on the Law of the Sea, ships and aircraft are entitled to transit passage through international straits, limiting the extent to which the littoral states can obstruct international navigation (United Nations, 1982). Consequently, their geopolitical advantage lies less in the ability to close the strait than in their capacity to maintain and shape the security environment through which international traffic passes.
Thus, domestic security capacity becomes central to their influence. Increasing piracy and maritime insecurity during the early 2000s encouraged the littoral states to improve maritime surveillance, patrol capabilities and information sharing. Indonesia, Malaysia and Singapore subsequently developed a more institutionalised system of cooperation through coordinated patrols and surveillance mechanisms. The Malacca Strait patrols, launched in 2006 following the MALSINDO patrols established in 2004, brought together coordinated sea patrols, the “Eyes in the Sky” air patrol initiative, and intelligence exchange (Koh, 2016). Furthermore, the significance of this arrangement extends far beyond the counter-piracy efforts. By demonstrating that they can collectively maintain the security of an internationally important channel, the littoral states strengthen their position as indispensable regional security actors. The strait generates potential geopolitical leverage, but security capacity determines whether that leverage can actually be exercised. Indonesia, Malaysia and Singapore do not possess the conventional military power of China or the United States, yet their position gives their security decisions consequences for states that are considerably more powerful.
This reflects what Khanna (2008) describes as the strategic importance of “second world” states, whose geographical and economic positions make them important objects of competition between larger powers. In the case of Southeast Asia, this competition increases the value of maintaining influence and access in strategically positioned states such as Malaysia and Singapore. Mahbubani (2008) similarly emphasises the strategic constraints facing small states such as Singapore, arguing that their security depends on pragmatic relations with multiple powers rather than exclusive alignment with just one. The strait therefore amplifies the geopolitical significance of the littoral states because their influence derives not from superior military capabilities, but from the fact that competing powers have strong incentives to maintain their cooperation.
4.2 External Assistance: Strengthening Security Capacity Without Creating Strategic Dependence
External assistance has contributed significantly to this capacity during the period when piracy represented a major concern. External actors provided technology, training and other forms of maritime security support. Indonesia, for example, received assistance for coastal radar and surveillance capabilities, while wider international cooperation contributed to intelligence sharing mechanisms (Ho, 2009). Such assistance can strengthen the geopolitical position of the recipient state because it increases its ability to monitor and secure territory that is strategically important to others.
However, external involvement also creates a potential contradiction. In 2004, the United States proposed the Regional Maritime Security Initiative, which envisioned a stronger role for external forces in maritime security. Indonesia and Malaysia were concerned about the sovereignty implications of greater foreign interference, reflecting their preference for security in the strait to remain primarily the responsibility of the littoral states (Koh, 2016). This illustrates that the Southeast Asian states were not simply passive recipients of security assistance from global powers, but they actually sought to benefit from international cooperation while maintaining political control over the strait. The resulting model therefore emphasised cooperation rather than direct external policing. The International Maritime Organisation’s (IMO) description of the Cooperative Mechanism in the Straits of Malacca and Singapore similarly highlights that the littoral states retain primary responsibility while working with user states and other stakeholders (IMO, 2026a).
Moreover, this distinction is central to strategic influence because external assistance can either increase or decrease autonomy. When technology, training and intelligence strengthen a state’s own institutions, external assistance allows it to exercise greater influence than its domestic capacities would otherwise allow. Where a state becomes dependent on foreign actors for basic security functions, the same assistance can produce the opposite effect, in which external assistance only creates the illusion of sovereign statehood rather than building genuine domestic capacity and autonomy. The Malacca Strait therefore provides a relatively strong example of external assistance strengthening rather than replacing domestic capacity, allowing the littoral states to exercise greater influence while retaining primary responsibility for their security.
4.3 Security Partnerships and Strategic Balancing: Expanding the Littoral States’ Bargaining Power
The security relationships surrounding the strait further demonstrate how geographical location can increase the bargaining capacity of smaller states. Major powers have incentives to maintain close relations with Singapore, Malaysia and Indonesia because access to the strait is connected to wider commercial interests and supply chain resilience. This creates a form of asymmetric interdependence: although both sides benefit from cooperation, their dependence is not equal. Southeast Asian states rely partly on external powers for certain advanced capabilities, while external powers depend on the cooperation of the littoral states to preserve a secure SLOC.
Singapore’s defence relationships provide a clear example: in January 2026, the United States approved a possible sale of up to four P-8A maritime patrol aircraft and related systems to Singapore, with an estimated value of $2.316 billion. The aircraft would strengthen Singapore’s maritime surveillance and reconnaissance capabilities (Defense Security Cooperation Agency, 2026). Such a relationship does not necessarily imply political dependence. Singapore simultaneously participates in the Five Power Defence Arrangements with Malaysia, Australia, New Zealand and the United Kingdom. In 2026, the participating defence ministers reaffirmed the arrangement’s continued relevance while noting its expansion beyond conventional military exercises into maritime security, counter-terrorism and humanitarian assistance (Ministry of Defence Singapore, 2026).
This diversification is politically significant because a Southeast Asian state that can cooperate with several external powers has greater room to manoeuvre than one dependent upon a single security provider. Rather than choosing between competing great powers, the littoral states can use their geographical significance to maintain relationships with multiple actors. Their influence therefore comes partly from being useful to competing powers simultaneously.
Additionally, security capacity also matters because threats to the strait are not exclusively conventional. Piracy, armed robbery, terrorism and trafficking require sharing intelligence and coordinated law enforcement alongside military capabilities. The International Maritime Organisation identifies regional cooperation in the Malacca and Singapore Straits as an important example of how information sharing and coordinated action can address piracy and armed robbery (IMO, 2026b).
These arrangements also demonstrate a form of deterrence distinct from traditional military deterrence. Indonesia, Malaysia and Singapore do not need the ability to defeat a major power in a conventional war. Instead, they need to make disruption difficult, detect threats quickly and coordinate a response. Their influence therefore derives partly from their ability to provide a security function that major powers cannot easily reproduce without involvement in Southeast Asian affairs.
4.4 The Limits of Disproportionate Influence: International Law, External Dependence and Alternative Routes
The strait therefore gives Southeast Asian states significant geopolitical influence, but not unlimited power. The first constraint is international law: the littoral states cannot treat the strait as a sovereign territory over which they have unrestricted control because transit passage is protected under UNCLOS (United Nations, 1982). The second constraint is dependence: advanced surveillance, military equipment and intelligence capabilities frequently require relationships with more powerful states. SIPRI’s latest arms-transfer data illustrates the wider pattern of Southeast Asian states relying on multiple foreign suppliers instead of possessing complete defence-industrial independence (Béraud-Sudreau et al., 2022). Thirdly, geographical leverage can encourage other states to reduce their dependence on the strait. For instance, China’s persistent concern about vulnerability to disruption has encouraged efforts to develop alternative transport and energy routes. This, however, does not eliminate the strait’s importance, but it demonstrates that chokepoint power is not necessarily permanent.
The strait gives Southeast Asian states influence beyond what their conventional capabilities alone would suggest, but it does not fundamentally change the wider regional balance of power. Its strategic importance gives Indonesia, Malaysia and Singapore greater bargaining power and diplomatic relevance because major powers have a strong interest in maintaining access to the waterway. Nonetheless, this influence remains dependent on the continued importance of the strait and on the ability of the littoral states to maintain its security. The strait therefore functions less as a source of direct power over major states and more as a means of increasing the strategic value of Southeast Asian states within the wider Indo-Pacific order.
5. Maritime Diplomacy of Malacca: A Contemporary Analysis
The maritime diplomacy of littoral states around the Strait of Malacca, and the broader ASEAN states, with respect to the world in general and great powers in particular, has been historically determined by the systemic great-power polarity, which is in turn influenced by strategic control over this maritime chokepoint. The institutionalisation of the UNCLOS regime and the end of the Cold War redefined foreign relations of the states concerned, with US entrenchment in ASEAN waters being seen more as an accident and rendered anachronistic to contemporary realities, rather than a liberal constabulary role (Till, 2018; Kraska & Pedrozo, 2013) under the competing lucrative geoeconomic gravity of China in the 21st century (Khanna, 2008). The ensuing multipolar world order of today allowed the littoral states of ASEAN to pursue the “ASEAN centrality” policy more proactively, hedging between Chinese economic engagement and cooperative strategic security and technological support of the US, ensuring strategic autonomy and durable stability-oriented growth (Kuik, 2016; Acharya, 2014).
5.1 Revisionist Tides: Attitudes of States
ASEAN aspires to attain invulnerability to hegemonic trends as practised by European states through the European Union, but without supranationalism, a goal to transition away from the spectre of the hegemonic subjugation of the US and China, which became a perpetual foreign policy driver in the region in the 21st century (Khanna, 2008). Since the aftermath of the 2016 Permanent Court of Arbitration verdict on the South China Sea disputed maritime claims (PCA, 2016), the maritime diplomacy of the Asiatic Mediterranean has been underpinned by grey-zone revisionist activities alongside transit passage through the Strait of Malacca and innocent passage through territorial waters (Godbole, 2016; Till, 2018), balancing aggressive maritime claims and recalibrating state strategies against anxieties of strategic encirclement (Sen, 2002). As Mahbubani and Sng (2017) have observed, the guns have fallen silent under the ASEAN Way, and kinetic war has been superseded by grey-zone coercion and sub-threshold strategic friction (Till, 2018).
5.2 The Malacca Dilemma: A Strategic Anchor and Stabiliser
The physical geography of SLOCs poses the classical interdependence-vulnerability vector of naval statecraft. Foremost among these vulnerabilities is the Malacca Dilemma, exemplified by the US PACOM being the most equipped and proactive naval arm of the US and its FONOPs (Khanna, 2008). The Chinese believe that in an escalated geopolitical conflict or impasse, like that over the Taiwan Strait, the US and its allies might impose an interdiction operation at the entrance of the Malacca and Singapore Straits, choking the energy-import-dependent economy of China, rendering their A2/AD envelope irrelevant.
Although the Malacca Dilemma is inherently a Chinese strategic supply chain vulnerability, the consequences of a logistical disruption are global. Any blockage would not only remain a localised Chinese crisis, but inter alia spiral into a severe commercial supply chain crisis for Europe, destabilise the energy security of key US allies in the Pacific and spike oil prices. Thereby, a large number of states have vested interests in keeping the Strait of Malacca unimpeded.
The Malacca Dilemma equips the littoral states of Indonesia, Malaysia and Singapore, and the wider ASEAN when analysed within the Asiatic Mediterranean expanse, with an asymmetric bargaining capacity in national self-determination, strategic autonomy and diplomatic leverage disproportionate to what their conventional and economic capabilities theoretically command. This disproportionate leverage positions these Southeast Asian states as pivotal second-world swing states (Khanna, 2008). Yet, the same leverage also invites intense external coercion dynamics from competing great powers in an attempt to assert naval dominance and define secure supply chain resilience on a unilateral or hegemonic vector (Kuik, 2016; Acharya, 2014).
In response to these competing interests, the littoral states have established their sovereign military assets and economic infrastructure through liberal relations and balanced partnerships with the US in strategic cooperation, and the European states and China in economic cooperation, a formidable manifestation of subtle multilateralism. This dynamic is reminiscent of pre-colonial Malaccan statecraft, wherein the chokepoint access was ensured through autonomous tributary diplomacy in a more stable precedent than colonial subjugation or post-Cold War great-power vassalage for the region (Wolters, 1999). Thus, effective hedging by the littoral states not only advances their domestic interests but also positions them as systemic regional stabilisers. Their vested interest in regional stability and order constrains Sino-US rivalries from degenerating into conventional confrontations and disrupting equilibrium in the region. They act as sovereign guarantors which share critical interests with both camps, anchoring both actors to the primary vector of unimpeded maritime passage (Goh, 2007; Kuik, 2016).
5.3 Hedging: The Littoral Triad and ASEAN
To understand how this structural hedging functions in practice, the operational postures of Singapore, Malaysia and Indonesia, here referred to as the littoral triad, and ASEAN must be evaluated through their distinct diplomatic, economic and security calibrations. While the littoral triad executes bilateral hedging at the state level, ASEAN provides the collective multilateral umbrella that prevents the region from fragmenting into competing great-power blocs.
5.3.1 SINGAPORE: STRATEGIC LOGISTICS NODE AND COMMERCIAL CONDUIT
The state of Singapore is located at the narrowest funnel of the Strait of Malacca. It executes hedging through high-end defence integration with the US and counterbalances this external cooperative assistance through deep economic interdependence with China, a highly calibrated liberal nexus which is difficult for the competing great-powers to disengage from easily.
While avoiding formal treaty-alliance status to preserve its sovereign flexibility, Singapore acts as the pivotal operational anchor for the US regional security presence, a flexible non-treaty node within the San Francisco hub-and-spoke security architecture in the Pacific. Under the 1990 Singapore-US bilateral MoU and its 2019 protocol of amendment (MINDEF Singapore, 2019), Singapore hosts COMLOG WESTPAC and provides essential deep-water carrier facilities at Changi Naval Base. This facilitates rotational deployments of the US maritime patrol aircraft and littoral combat vessels, which allows for logistical support to the US naval constabulary activities in and around the Asiatic Mediterranean (Goh, 2007; Till, 2018).
These logistical arrangements are governed by commercial-style host-nation status agreements, which ensure the US cannot exercise unilateral combat operations from Singaporean bases. Singapore conducts joint bilateral military exercises with the People’s Liberation Army Navy of China, such as Exercise Maritime Cooperation and Exercise Cooperation, demonstrating that its defence facilities serve bilateral access rather than an exclusive anti-China military alliance, a quintessential manifestation of balancing power dynamics with complex interdependence.
Singapore further serves as a prominent financial gateway and foreign investment partner for China, anchoring bilateral public industrial initiatives and offshore Renminbi clearing mechanisms (Khanna, 2008).
Therefore, by tethering US naval posture to its logistics and Chinese capital to its economy, Singapore has been able to maximise its survival margin, transforming from an exposed vulnerability into an indispensable maritime and commercial nexus. The nominal GDP of Singapore increased by 1200% between 1990 and mid-2020s through its pragmatism (World Bank, 2026; Mahbubani & Sng, 2017).
5.3.2 MALAYSIA: THE QUIET DIPLOMATIC BALANCER
The state of Malaysia flanks the northern littoral perimeter of the Strait of Malacca. It practises a policy of quiet diplomatic balancing by decoupling territorial maritime security frictions from its geoeconomic partnership with Beijing (Kuik, 2016).
Malaysia, in its EEZ, off the coast of Sarawak, specifically around the Kasawari gas fields and Luconia Shoals, encounters regular presence of the Chinese Coast Guard and its grey-zone assertions. The Royal Malaysian Navy and maritime agencies exercise operational shadowing of such fleets, manifesting quiet assertion of sovereign resource extraction rights, without escalating diplomatic tensions by taking confrontational legal recourse (Till, 2018). Malaysia further balances these security anxieties by integrating itself with the Chinese infrastructure investments of the BRI, while retaining fundamental defence diversification capabilities through the FPDA and bilateral surveillance cooperation with the West (Acharya, 2014).
The pragmatic hedging policy of bifurcation of strategic and economic interests of Malaysia has helped expand its nominal GDP by 900% from 1990 to mid-2020s (World Bank, 2026; Khanna, 2008).
5.3.3 INDONESIA: THE ARCHIPELAGIC FULCRUM AND MINERAL DOWNSTREAMING HUB
The state of Indonesia flanks the southern perimeter of the Strait of Malacca, controlling alternative sea corridors of Sunda and Lombok Straits. It executes hedging through its constitutional doctrine of non-alignment, or bebas-aktif, and archipelagic defence (Acharya, 2014).
In alignment with its strategic vision as a “Global Maritime Fulcrum”, Indonesia defends its sovereign rights in the EEZ of the Natuna Sea against incursions by foreign fishing and coast guard vessels, while routinely hosting multilateral strategic exercises like the Super Garuda Shield alongside the US and other regional partners (Till, 2018). It balances this maritime defence engagement by absorbing massive inflows of Chinese industrial capital in financing its domestic infrastructure and indigenous critical minerals downstreaming policy (Khanna, 2008).
Through the pragmatic balance of foreign relations in harmony with its policy of non-alignment, while leveraging strategic control over alternative maritime chokepoints, Indonesia’s nominal GDP expanded by over 1200% from 1990 to mid-2020s, establishing it as the sole trillion-dollar economy of Southeast Asia (World Bank, 2026; Kuik, 2016).
5.3.4 ASEAN: THE MULTILATERAL UMBRELLA
At the regional level, these state-specific hedging strategies are aggregated and institutionalised through the intergovernmental architecture of “ASEAN Centrality” (Acharya, 2014). It provides multilateral consultative platforms, such as the ARF, the EAS and the ADMM-Plus among others, which enmeshes competing superpowers into liberal dialogues (Goh, 2007; Kuik, 2016). This is codified in the ASEAN Outlook on the Indo-Pacific, which reframes external containment doctrines into open, inclusive and development-driven maritime frameworks (Mahbubani & Sng, 2017). Additionally, ASEAN has been sustaining multilateral negotiations over a binding Code of Conduct for the South China Sea, aiming to establish normative guardrails against unilateral kinetic escalations along vital maritime lanes in the region (Till, 2018).
Therefore, through this collective intergovernmental hedging by ASEAN aimed at preservation of the Strait of Malacca as an open global commons and pragmatic liberal neutrality and stability across the Asiatic Mediterranean, the combined nominal GDP of the ASEAN bloc expanded by nearly 1000% from 1990 to mid 2020s (World Bank, 2026; Khanna, 2008).
6. UNCLOS: Sovereignty and Transit Passage
The geopolitical significance of the Strait of Malacca is shaped by the legal regime governing navigation through it. Indonesia, Malaysia and Singapore have sovereignty over their own territorial waters, but the strait is also an international waterway, and it is important even beyond Southeast Asia. Its location between the Indian Ocean and the Pacific means events in the strait can affect energy and commercial flows between the Middle East and South Asia, as well as Southeast Asia and East Asia, with wider consequences for global maritime trade. As a result, the legal regime therefore determines both the limits of littoral-state control and the rights of external states to navigate through the strait. Under Article 34 of the United Nations Convention on the Law of the Sea ( UNCLOS), states bordering international straits retain sovereignty and jurisdiction over their territorial seas. But Articles 37-44 of the UNCLOS establish a different transit passage regime for straits used by international shipping. Under Article 38, ships and aircraft have the right of transit passage, and Article 44 prevents states bordering the strait from blocking transit or suspending passage. As such, Indonesia and Malaysia cannot legally regard the strait as an ordinary territorial waterway and then close it to foreign shipping. In other words, their sovereignty is protected by an internationally protected navigational right, rather than above it (United Nations, 1982; Kraska & Pedrozo, 2013).
6.1 De jure vs De facto Regimes of Maritime International Law in Relation to State Postures
Such an important distinction between legal entitlement and actual control is fundamental to assessing disproportionate influence. De jure, the littoral states keep sovereignty over their territorial seas, but their restrictive power is limited; de facto, however, they retain considerable influence over how the strait is handled and secured. On the other hand, UNCLOS allows navigation safety, traffic separation and pollution control to be regulated without interfering with transit. The IMO’s Cooperative Mechanism reflects this arrangement, with Indonesia, Malaysia and Singapore maintaining primary responsibility for navigational safety and environmental management while cooperating with user states and other stakeholders (IMO, 2026). International law transforms the littoral states from potential gatekeepers to key guardians of the SLOC (IMO, 2026).
State practice is also important, as the legal regime does not operate separately from geopolitical power. Major naval and commercial powers continue to use the strait without seeking permission from the littoral states for every transit. Indonesia, Malaysia and Singapore have refused to accept arrangements that would transfer the key security responsibilities to external powers. Their response to proposals such as the United States’ Regional Maritime Security Initiative illustrates the tension between accepting assistance from outside while maintaining littoral-state power. This model allows external powers to bring resources and expertise but not take over the strait (Kraska & Pedrozo, 2013).
6.2 Comparison with other SLOCs
A comparison with other strategic maritime chokepoints demonstrates why this legal structure matters. The Suez Canal and Panama Canal are artificial waterways with specific treaty and institutional arrangements, and the Strait of Malacca is a naturally occurring international route of passage governed mainly by the law of the sea. The littoral states therefore do not exercise the same concentrated commercial control as canal authorities. The Strait of Hormuz, by contrast, demonstrates how maritime law can become much more contentious when geopolitical tensions intensify. Malacca has relatively stable legal status, and Indonesia, Malaysia and Singapore are able to benefit from governance without having the freedom to block foreign vessels.
China provides perhaps the best example of the tension between dependence on the strait and great-power strategy. Its heavy reliance on maritime energy imports going through Malacca has produced the so-called Malacca Dilemma, but China’s position on maritime rights elsewhere demonstrates that, for all its power, great powers do not always interpret maritime law to the benefit of littoral states. The South China Sea Arbitration of 2016 also illustrates this bigger issue: the Permanent Court of Arbitration issued findings concerning maritime entitlements and China’s maritime claims, which China rejected along with the tribunal’s jurisdiction and award (PCA, 2016).
The case may not be directly relevant to Malacca’s legal system, but it demonstrates the bigger picture of international maritime law – legal rules can define rights and obligations, but their geopolitical impact is ultimately the result of state behaviour and acceptance. This is important because China’s reliance on Malacca gives the littoral states bargaining power but does not give them unlimited coercive power. Beijing has a strategic interest in maintaining good relations with Indonesia, Malaysia and Singapore because the Strait is critical to its trade and energy security. China is also pursuing other routes and infrastructure via the Belt and Road Initiative to reduce its vulnerability. The development of alternative routes therefore puts a limit on the durability of chokepoint leverage. The same logic applies to other major users: the more countries invest in alternative routes, pipelines, ports and supply chains, the less strategically essential Malacca becomes.
The legal framework therefore creates a form of constrained geopolitical influence. UNCLOS does not give the littoral states absolute control of international navigation. Still, it does protect their sovereignty and make them the central actors in managing one of the world’s most important maritime routes. Their influence is therefore disproportionate, not because international law grants them an absolute right to “control” the strait but because the combination of sovereignty, geographical location and international recognition of their responsibility makes their cooperation strategically valuable to much more powerful states.
Malacca therefore represents a form of institutionalised chokepoint power. Indonesia, Malaysia and Singapore cannot exercise absolute control over the strait, but their geographical position and legal responsibility make cooperation with them strategically important to China, India, Middle East energy producers, European economies and other major trading powers. Here, unlike other chokepoints, we have an institutional chokepoint power in the Southeast Asia region. Although it is not the case that the Southeast Asian countries have absolute control of the Strait, they have more influence and economic leverage by making sure that there is an open and secure Malacca, as well as the interests of China, India, the Middle East, Europe and other major trading powers.
7. Conclusion
The Strait of Malacca gives Indonesia, Malaysia and Singapore a degree of geopolitical influence that exceeds their conventional capabilities. Its importance to global trade and energy security makes cooperation among the littoral states crucial to major powers. At the same time, their geographical position has consequences for their security and foreign policies beyond their individual capabilities.
However, the strait does not give these states unrestricted control over international shipping or the ability to dictate the behaviour of stronger powers. International law, reliance on external assistance and the possibility of alternative routes all limit the extent of their leverage. Simultaneously, the development of regional security cooperation and relationships with multiple external powers has allowed the littoral states to strengthen their position without surrendering primary responsibility for the strait.
Therefore, the strait generates disproportionate but conditional geopolitical influence for the littoral states. Its geographical importance provides the foundation for this influence, but the ability to secure the strait, manage external involvement and maintain strategic autonomy is what allows Indonesia, Malaysia and Singapore to extend their political influence globally. Ultimately, the strait does not fundamentally change the regional balance of power, but it gives the littoral states a strategic relevance that is considerably greater than their conventional power alone would imply.
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