What Hormuz reveals about Malacca and the quiet risk to global trade
Hormuz shows how fast access can become political. Malacca shows how quietly risk can build in the Asia‑Pacific, where trade volumes are higher, routes are tighter and alternatives are limited. These shifts could change costs, routes and assumptions that businesses rely on every day.
The blockade of the Strait of Hormuz by Iran, and now by the United States, has refocused attention on an age‑old vulnerability. With more than 90% of international trade still dependent on sea passage, the global economy and supply chains remain heavily exposed to disruption at a small number of maritime chokepoints. When those routes are constrained, the consequences propagate quickly.
A structural vulnerability
Malacca is operationally narrower and more heavily transited relative to Hormuz. At its tightest point, near the Phillips Channel south of Singapore, the strait contracts to around two nautical miles. It lies between Malaysia and Indonesia, with Singapore positioned precisely where east-west maritime traffic converges.
Around 94,000 vessels pass through it each year, carrying roughly a quarter of all globally traded goods and close to a third of officially registered seaborne oil. It is the primary maritime link between the Indian Ocean and the Pacific, connecting energy producers and exporters with industrial economies at a scale unmatched by any other route.
Precedent and pressure after Hormuz
The escalation in the Middle East has revived unease about how resilient this arrangement really is. When Singapore’s foreign minister, Vivian Balakrishnan, was asked whether Singapore would engage Iran over transit arrangements in Hormuz, his response was unambiguous. Negotiation over access or tolls would establish a precedent that directly contradicts international law. More importantly, it would open the door for the same logic to be applied elsewhere.
For Singapore, that precedent would be destabilising. If negotiated passage or transit fees became normalised, Malacca would be an obvious candidate for similar pressure. Malaysia and Indonesia would face growing political and domestic incentives to assert leverage over a waterway that underpins global trade but runs through their territorial seas.
Law, power and market behaviour
Freedom of transit through international straits is protected by Article 44 of the United Nations Convention on the Law of the Sea, which explicitly prohibits states from hampering or suspending passage. These provisions are widely considered part of customary international maritime law.
Yet Hormuz has again illustrated a familiar dynamic. Formal guarantees are only as strong as the power and restraint that underpin and enforce them. When those weaken, markets forces respond faster than institutions.
China and the persistence of the Malacca dilemma
China has been alert to this exposure for years. In 2003, former President of the People's Republic of China Hu Jintao described what became known as the Malacca dilemma: namely, Chinese economic growth depended on energy and trade flows passing through a narrow chokepoint it did not control. Two decades of policy have followed, aimed at diluting that risk. Overland transit infrastructure directly connecting Chinese demand centres with Central Asia and Russia, corridors through Myanmar, and port and logistics investments across the Indian Ocean were all designed to reduce reliance on a single maritime route.
Those alternatives matter at the margins, but they have not displaced the core reality. Most of China’s oil and gas still arrives by tanker, and that maritime traffic destined for the Chinese eastern seaboard continues to move through Southeast Asian straits.
Pressure without closure
This is the context in which Beijing will assess the recently announced defence cooperation partnership between the United States and Indonesia. Publicly framed around training and capacity building, the agreement places particular emphasis on surveillance and interoperability. In practice, it increases US visibility and strategic density across the approaches linking the Indian Ocean to the South China Sea without requiring confrontation.
The risk is not imminent closure. Chokepoints rarely fail in dramatic fashion. Instead, a dynamic where pressure accumulates incrementally as operating space tightens and risk is priced more aggressively into shipping, insurance and energy markets.
Hormuz has reminded states how quickly assumptions about free transit can be tested and how unilateral action can threaten these critical waterways. Malacca carries that lesson into a far more congested and economically consequential space.
Contestability as the real risk
The waterway remains permissible, governed by law and convention, but it is increasingly shaped by surveillance and strategic positioning rather than neutrality.
Chokepoints do not have to close to change behaviour. They only need to become contestable. In that sense, Malacca is not a future crisis waiting to happen. It is already part of the strategic landscape, quietly setting constraints and shaping choices long before any decisive moment arrives.
