Interviews | Economy | Southeast Asia

When Neutrality Fails: ASEAN in a Malacca Disruption Scenario

Insights from Looi Teck Kheong.

Trans-Pacific View author Mercy Kuo regularly engages subject-matter experts, policy practitioners, and strategic thinkers across the globe for their diverse insights into U.S. Asia policy. This conversation with Looi Teck Kheong – ASEAN specialist consultant, advocate, and solicitor of the Supreme Court of Singapore and author of “The Enforcement Age: The Maduro Capture and the End of Strategic Patience” (2026) – is the 513th of “The Trans-Pacific View Insight Series.”

Explain why the conventional framing of kinetic conflict in the Strait of Malacca is incomplete.

The conventional framing assumes that the Strait of Malacca becomes strategically relevant only during a direct military confrontation involving blockade, mining, piracy escalation, or missile attacks. That view is increasingly incomplete because modern geopolitical competition is now conducted as much through regulatory coercion, sanctions, inspections, insurance restrictions, and compliance fragmentation as through kinetic force.

Malacca does not need to be physically closed to become dysfunctional. The more plausible disruption scenario is political and operational rather than military. A U.S.-China confrontation over Taiwan or the South China Sea could generate incompatible compliance demands on ASEAN littoral states without a single missile entering the Strait itself.

This transforms Malacca from a freedom-of-navigation issue into a contested governance corridor. The critical vulnerability is therefore not merely geography, but ASEAN’s ability to sustain credible neutrality under simultaneous pressure from both major powers.

That distinction matters because approximately one-fifth to one-quarter of global maritime trade and nearly 29 percent of maritime oil flows transit the Strait. The global economy is more vulnerable to prolonged uncertainty and fragmented compliance regimes than to short-duration kinetic shocks.

Describe the most plausible scenario of disruption to the Strait of Malacca and the key variables underpinning this scenario.

The most plausible scenario is not total closure, but conditional transit.

A limited Taiwan blockade or sustained South China Sea confrontation could lead both Washington and Beijing to demand selective inspections, overflight restrictions, cargo scrutiny, or port-access limitations targeting vessels linked to the opposing side’s logistics ecosystem.

ASEAN states such as Singapore, Malaysia, and Indonesia would then face mutually incompatible demands. Compliance with one side risks being interpreted as alignment against the other.

The key variables underpinning this scenario include:

Intensity and duration of U.S.-China confrontation – whether tensions remain episodic or evolve into sustained strategic coercion. 

Degree of sanctions escalation – especially involving dual-use technologies, semiconductors, energy cargoes, and military-linked supply chains. 

ASEAN political cohesion – whether ASEAN members can maintain a coordinated neutrality posture or fragment into divergent national responses. 

Insurance and shipping market reactions – war-risk premiums and liability uncertainty may disrupt shipping rhythms even before physical threats emerge. 

Availability of rerouting alternatives – Lombok and Sunda Straits provide alternatives, but at substantial cost, delay, and congestion risk. 

In this scenario, trade does not stop immediately. Instead, predictability collapses. That is often more economically damaging than outright closure because modern supply chains depend on timing precision rather than merely physical movement.

Examine the strategic relevance of the Strait of Malacca in China-U.S. geopolitical competition.

The Strait of Malacca sits at the intersection of energy security, maritime trade, and Indo-Pacific power projection. It is central to China’s long-standing “Malacca Dilemma,” reflecting Beijing’s concern that external powers could threaten critical sea lines of communication. 

China relies heavily on the Strait for imported energy and trade flows linking the Middle East, Africa, and Europe........

© The Diplomat