Malacca Strait Blockade Risk and Global Supply Chain Shocks: Deepening Structural Instability and Scenario-Based Response Strategies

Executive Summary

Malacca Strait Blockade Risk and Global Trade Disruption Concerns

Executive Summary

□ Nature of the Risk: Structural Instability, Not a Temporary Crisis - The chain reaction of shocks from Hormuz (US-Iran conflict) to Malacca (spillover) signifies a transition to a phase of structural instability, not just isolated incidents. - The Strait of Malacca is the single largest chokepoint, handling 29% of global maritime oil trade and over one-third of global trade. - As long as tensions in the Strait of Hormuz persist, the bottleneck pressure on the Strait of Malacca cannot be structurally resolved.

□ Current Situation Diagnosis: Simultaneous Realization of Multiple Risks - Repeated disruptions and diversions of vessels due to Iran's imposition of transit fees and intensified control over shipping lanes in the Strait of Hormuz. - Overlapping global supply chain shocks resulting from simultaneous instability in the three straits: the Red Sea, Hormuz, and Malacca. - A vicious cycle where cracks in the Western alliance's coordinated response (US non-recognition vs. European pragmatic acceptance) strengthen Iran's bargaining power.

□ Scenario Outlook: Baseline Scenario (50-55% probability) Indicates Prolonged Tensions - Even with an extension of the interim agreement between the US and Iran, the lack of a permanent accord could lead to a structural increase in freight rates by 10-30%. - If the pessimistic scenario (20-25% probability) materializes, oil prices could surge by over $30-50 per barrel, creating stagflationary pressure in Asia. - Concerns arise about a complex risk scenario if China's 'Malacca Dilemma' combines with tensions in the South China Sea.

□ Key Response Directions: Parallel Implementation of Short-Term Cost Management, Mid-Term Supply Chain Reorganization, and Long-Term Structural Transformation - (Short-term) Immediately pursue additional inventory stockpiling for 30-45 days, re-evaluate war risk insurance coverage, and implement diversified ordering. - (Mid-term) Diversify energy and raw material supply sources away from Middle East dependency (e.g., US, Australian LNG) and secure capacity for alternative routes (Lombok Strait, Sunda Strait). - (Long-term) Institutionalize supply chain scenario planning linked to geopolitical risks and establish a digital visibility system.

□ Top Priority Alert: Risk of Complacency During Optimistic Phases - The probability of an optimistic scenario is only 20-25%; complacency during short-term stability could delay investments to improve structural vulnerabilities. - The chain risk of Hormuz and Malacca stems from a triple structural problem: Middle Eastern geopolitics, cracks in the international maritime legal order, and energy supply chain concentration. - Companies must immediately shift their paradigm from 'crisis response' to ''continuous risk management systems'.

I. Issue Situation Analysis

Malacca Strait Blockade Risk and Global Trade Disruption Concerns

Issue Situation Analysis

1. Issue Background and Developments

□ Strategic Importance of the Strait of Hormuz - A critical energy route through which approximately one-fifth of the world's oil and gas supply passes [11]. - The strait was effectively paralyzed by US-Israeli airstrikes against Iran in late February 2025 [4]. - Over 100 days of severe maritime transport disruption caused global supply chain shocks [4].

□ Structural Role of the Strait of Malacca - A funnel-shaped strait approximately 560 miles long between Malaysia and Indonesia [5]. - Connects the Indian Ocean and the Pacific Ocean, handling over one-third of global trade [5]. - Approximately 23.2 million barrels of crude oil passed through daily as of the first half of 2025 [11]. - This accounts for 29% of global maritime crude oil trade. - It is the world's largest oil transit strait, exceeding the Strait of Hormuz (21 million barrels/day) [2][11].

□ Interconnectedness of the Two Straits - A significant portion of the crude oil passing through Hormuz travels via Malacca to East Asia [5][8]. - A chain reaction where tensions in Hormuz lead to increased transit volumes in Malacca, exacerbating the bottleneck [1]. - The Strait of Malacca is defined as the 'second chokepoint for Asian energy and trade supply chains' [8].

2. Current Situation (Latest Trends)

□ Ongoing Dispute over Control of the Strait of Hormuz - Partial reopening of the Strait of Hormuz and a downturn in oil prices following the interim agreement between the US and Iran [5]. - Iran announced its intention to impose service fees on vessels transiting after the expiration of the 60-day agreement [6]. - The Iranian military command issued a warning of 'strong response' to vessels not complying with designated routes [7]. - Ongoing confusion between vessels using designated Iranian routes and those using Omani coastal routes [12]. - At least eight vessels have attempted to enter the Strait of Hormuz and subsequently turned back.

□ Realization of Spillover Effects in the Strait of Malacca - The Strait of Malacca has already experienced spillover effects due to simultaneous disruptions in the Red Sea and Hormuz [1]. - Malaysian ports are handling increased cargo volumes but face growing operational pressure [1]. - Irregular arrival patterns at Malacca due to vessel schedule adjustments, slowdowns, and waiting times for security assessments [4][5].

□ Entry into a Fee Negotiation Phase - Some major European countries have shifted to a stance where paying transit fees for passage through Hormuz is considered unavoidable [8]. - The United States and Gulf Arab states deny the authority of Iran and Oman to impose such fees [8]. - Negotiations between the US and Iran regarding jurisdiction over the Strait of Hormuz are ongoing, but disagreements persist [13].

3. Key Actors, Positions, and Interests

□ Iran - Claims sole jurisdiction over the Strait of Hormuz [13]. - Seeks to secure economic benefits and diplomatic leverage by imposing transit fees [6][9]. - Manages strategic partners like China by offering fee exemptions to 'friendly nations' [6].

□ China - Approximately 80% of its imported crude oil passes through the Strait of Malacca, creating a structural vulnerability known as the 'Malacca Dilemma' [5]. - Urges freedom of navigation in the Strait of Hormuz and calls for cautious responses from all parties [10]. - Accelerating policies for energy supply diversification and strategic reserve expansion [5].

□ United States - Maintains a position of non-recognition of the fee imposition authority of Iran and Oman [8]. - Seeks to uphold the principle of freedom of navigation in the Strait of Hormuz and ensure the energy security of its allies [13]. - Continues negotiations with Iran while maintaining military options [7].

□ Japan and South Korea - Highly vulnerable to supply shocks due to the absolute majority of their crude oil imports originating from the Middle East. - Reaffirms the need to expand energy reserves and diversify supply sources [5]. - Supports multilateral maritime security cooperation to stabilize the Strait of Malacca.

□ Malaysia, Indonesia, and Singapore - As the three coastal states of the Strait of Malacca, they are directly involved in its management and security. - Face opportunities for increased port revenue due to higher cargo volumes, alongside increased security burdens. - Recognize the need to strengthen existing cooperation frameworks, such as the Malacca Strait Council (MSPC).

□ Major European Countries - Considering the possibility of accepting fee payments with a pragmatic approach [8]. - Shifting towards prioritizing energy supply stability over diplomatic principles.

4. Summary of Key Issues

□ Issue 1: Control of the Strait of Hormuz and Legality of Fee Imposition - Whether Iran's imposition of fees violates the right of innocent passage under international maritime law (UNCLOS). - Concerns that accepting the fees could set a precedent for Iran's control over the strait. - Conflict between the US-led principle of freedom of navigation and Iran's assertion of sovereignty [8][13].

□ Issue 2: Potential for Chain Blockade of the Strait of Malacca - Structural vulnerability where Hormuz congestion leads to a surge in Malacca transit volumes [1][4] - Potential overlap of geopolitical risks in the Strait of Malacca itself (South China Sea disputes, piracy, terrorism) - Physical capacity limitations of single alternative routes (Lombok Strait, Sunda Strait)

□ Issue 3: Structural Vulnerability of Asian Energy Security - China's 'Malacca Dilemma'—dependence on a single route for 80% of imported crude oil [5] - Issues concerning Japan's and South Korea's reliance on Middle Eastern crude oil and the adequacy of their strategic reserves - Food and logistics sectors, which require longer recovery times than the energy market [4]

□ Issue 4: Potential Restructuring of the Global Trade Order - Scenario of simultaneous destabilization of three choke points: Hormuz, Red Sea, and Malacca - Concerns about the resurgence of global inflation due to soaring maritime insurance premiums and freight rates - Long-term risk of rising food and fuel costs for vulnerable economies [4]

II. In-depth Analysis of Issues

Risk of Malacca Strait Blockade and Concerns over Global Trade Disruption

In-depth Analysis of Issues

1. Analysis of the Fundamental Causes of the Issue

□ Structural Deepening of Middle Eastern Geopolitical Instability - Hormuz Strait virtually paralyzed by US-Israel airstrikes on Iran (February 2025) [4] - Iran's nuclear program and regional hegemony conflicts spilling over into disputes over control of maritime transport routes - Iran's strategic choice to use Hormuz as a key leverage point in negotiations with the US [9] - Assertion of sole jurisdiction + imposition of transit fees = dual economic and diplomatic pressure tool [6][13]

□ Exposure of Overlapping Vulnerabilities in Global Maritime Transport Routes - Chain reaction structure: Red Sea (Houthi attacks) → Hormuz (Iranian blockade) → Malacca (spillover) [1] - Structural limitation where bottlenecks are concentrated in specific straits due to the absence of single alternative routes - Malacca Strait functions as the final transport route for crude oil transiting Hormuz, leading to double exposure [5][8]

□ Geographical Concentration Risk of Energy Supply Chains - 29% of global seaborne crude oil trade concentrated in the single Malacca Strait [11] - Approximately 80% of China's imported crude oil passes through Malacca, intensifying structural single-route dependency [5] - Alternative routes (Lombok Strait, Sunda Strait, etc.) are significantly inefficient in terms of distance and cost - Detours lead to substantial increases in voyage distance, accompanied by rises in freight, insurance, and delivery costs

□ Cracks in the International Maritime Law Order - Iran's claim of sole jurisdiction over Hormuz conflicts with the principle of freedom of navigation under UNCLOS - Potential for disputes over control of other straits, such as Malacca, if a precedent for fee imposition is set [2] - Divergence in positions: US non-recognition of fee imposition authority vs. Europe's pragmatic acceptance [8] - Breakdown of coordinated responses within the Western bloc strengthens Iran's negotiating position

2. Structural Context

□ Political Structure

- (US-Iran Confrontation) The Hormuz jurisdiction dispute is an extension of decades of hostility between the two countries - (Acceleration of Multipolar Order) Iran's policy of 'fee exemption for friendly nations' serves to strengthen strategic ties with the China-Russia bloc [6] - (ASEAN Regional Dilemma) Coastal states of Malacca (Malaysia, Indonesia, Singapore) face pressure to maintain neutrality between the US and China - They do not wish for their straits to be militarized or become conflict zones but are passively exposed to great power competition - (China's Dual Position) Urging freedom of navigation in Hormuz while maintaining strategic relations with Iran [10] - Possibility of continued imports of Iranian crude oil and enjoyment of fee exemptions coexist

□ Economic Structure

- (Asian Energy Dependence Structure) Key crude oil import route for East Asia's three major economic blocs: China, Japan, and South Korea [2] - Japan and South Korea have high dependence on the Middle East and limited capacity to secure alternative sources - (Freight Rate and Insurance Premium Surge Mechanism) War Risk Premium is immediately reflected when tensions in the straits escalate - Increased transportation costs lead to inflation spillover across raw material and consumer goods prices - (Supply Chain Restructuring Costs) Recovery of food and transportation systems delayed by over 100 days of Hormuz congestion [4] - Normalization of physical supply chains takes longer than for energy markets - (Transit Fee Economics) Institutionalization of transit fees for Hormuz could permanently alter the global energy cost structure

□ Security Structure

- (Choke Point Concentration Risk) Unprecedented situation where the three major straits—Hormuz, Malacca, and Red Sea—are simultaneously destabilized - (Naval Power Projection Limitations) Weakening of US naval control in Hormuz indirectly impacts confidence in Malacca's security - (Non-State Actor Threats) Potential for renewed activity by pirates and terrorist organizations in the Strait of Malacca - Historically, the Strait of Malacca was notorious as the world's most piracy-prone waterway - (Militarization of China's Malacca Dilemma) Concerns about accelerated Chinese naval buildup under the pretext of protecting energy routes [5]

3. Comparison of Historical Precedents and Similar Cases

□ 1973 Oil Shock (Arab Oil Embargo) - OPEC oil embargo against the West triggered a fourfold increase in oil prices and a global recession - Similarities to the present: Weaponization of energy supply, spillover of geopolitical conflicts into economic shocks - Differences from the present: Supply cutbacks from the production side then, versus control disputes over transport routes now - Blockades of transport routes are impossible to bypass for specific countries, leading to a wider impact range

□ Iran-Iraq War 'Tanker War' (1980-1988) - Both sides attacked tankers to disrupt the other's oil exports, escalating tensions in Hormuz - US Navy escorted Kuwaiti tankers (Operation Earnest Will) - Implications for the present: Confirmation of the repetitive and structural nature of Hormuz conflicts - Indirect impact on Asian exports transiting Malacca also occurred at that time

□ Ever Given Grounding in Suez Canal (2021-2022) - A mere six-day blockage of the Suez Canal resulted in global trade losses of approximately $10 billion per day - Demonstrated the asymmetric impact of blocking a single choke point on global supply chains - Implications for the present: A Malacca blockade is expected to have a much longer and broader impact than the Suez incident - Malacca is more vulnerable than Suez in terms of traffic volume and the absence of alternative routes

□ Red Sea Houthi Attacks (2023-2024) - Houthi rebel attacks on merchant vessels in Yemen led to a sharp decline in traffic through the Suez Canal - Ships rerouted around the Cape of Good Hope, increasing voyage duration by 10-14 days and freight rates by over 300% - Implications for the present: Realization of maritime transport route disruption by non-state actors - Similar scenarios are possible in the waters near Malacca [1]

□ Comprehensive Comparative Case Analysis

4. Key Variables in Issue Development

□ Variable 1: Outcome of US-Iran Negotiations on the Strait of Hormuz - The most critical juncture is whether the fee imposition system will be institutionalized after the 60-day interim agreement expires [6]. - If negotiations fail, the possibility of Iran re-implementing measures to forcibly designate and block passage routes arises [7]. - Even if negotiations succeed, concerns exist that the precedent of fee imposition could trigger disputes in other straits like Malacca [2].

□ Variable 2: China's Strategic Choice - The level of China's military response to resolve the 'Malacca Dilemma' [5]. - Choice between strengthening naval power near the Strait of Malacca versus playing a diplomatic mediation role. - Balancing the maintenance of energy cooperation with Iran against support for the principle of freedom of navigation in the Strait of Hormuz [10]. - The pace of China's development of alternative energy routes (pipelines and Arctic routes).

□ Variable 3: Response Capacity of Littoral States of Malacca - The level of cooperation in strait management and security among Malaysia, Indonesia, and Singapore. - Whether Malaysian ports will reach their handling capacity limits with a surge in additional cargo volume [1]. - The extent to which militarization is permitted and the stance on accepting great power intervention.

□ Variable 4: Alternative Supply Capacity in the Global Energy Market - The potential for the US to mitigate dependence on the Middle East through expanded shale oil and LNG exports. - The speed at which Asian countries release strategic petroleum reserves and diversify supply sources [5]. - The extent to which accelerating the transition to renewable energy contributes to mitigating short-term energy security risks.

□ Variable 5: Maintenance of Response Coordination within the Western Bloc - The collapse of the US-led pressure front against Iran if Europe's acceptance of fee imposition spreads [8]. - The functioning of joint maritime security response mechanisms at the G7 and NATO levels. - The speed of establishing a multilateral support system for vulnerable countries in response to UNCTAD warnings [4].