“He who commands the sea has command of everything.”  Themistocles, 480 BC

The ancient Athenian general said it before ships ran on fossil fuels, before containerisation, before a fifth of the world’s oil moved through a single 33-kilometre corridor. He said it at a time when sea power was about warships and oars. What he could not have anticipated is that, twenty-five centuries later, his maxim would be put to its most consequential modern test not by a naval superpower, but by a besieged and economically isolated Iran  one that has found, in the Strait of Hormuz, a leverage point so structurally irreplaceable that even the world’s most powerful military has struggled to neutralise it.

The 2026 Hormuz crisis, which began on 28 February when US and Israeli strikes triggered Iran’s blockade of the waterway, has now entered its fourth month. The ceasefire is fragile. Shipping levels remain a fraction of their pre-war baseline. And the central dispute has evolved into something that transcends the immediate military conflict. What Iran is now demanding  the right to impose tolls on vessels transiting an international strait  is not merely a negotiating tactic. It is a direct assault on the legal architecture that has governed global maritime trade for three decades.

The Tollbooth Nobody Saw Coming

Iran’s proposal, detailed in its 10-point framework for ending the conflict, would grant it and Oman the authority to charge vessels for passage through Hormuz. Several dozen ships have reportedly already paid the equivalent of $2 million per transit in Chinese yuan and rerouted past Iran’s Larak Island under IRGC oversight. Tehran calls it a navigation service fee. Legal experts call it something else entirely.

Under Article 26 of the United Nations Convention on the Law of the Sea (UNCLOS), coastal states are explicitly prohibited from imposing tolls on vessels exercising their right of transit passage through international straits. Iran never ratified UNCLOS, but that is largely immaterial  the principles have attained the status of customary international law, binding on all states regardless of formal adoption. The International Maritime Organization has stated bluntly that there is no legal basis for tolling an international strait.

What makes this moment genuinely unprecedented is not the act of coercion itself  Iran has threatened Hormuz repeatedly since the 1980s. What is new is the institutional ambition behind it. Iran is not seeking to disrupt the strait temporarily. It is seeking permanent security oversight jurisdiction over the waterway. As one former MI6 analyst noted, the demand is for the US to formally concede that the Iranian regime controls who passes, when, and on what terms. Experts at George Mason University have described it as Iran attempting to establish a precedent that could be replicated across other contested waterways  the South China Sea being the obvious candidate.

The 65% Problem

One reason Iran’s leverage is as real as it is: there is no credible bypass. The two pipeline alternatives  Saudi Arabia’s East-West pipeline through Yanbu and the Abu Dhabi Crude Oil Pipeline  are operating at maximum capacity. Together, they cover roughly 35% of normal Hormuz throughput. The remaining 65% has no viable alternative route, short of ships rerouting around the Cape of Good Hope, adding weeks to journey times and rendering many contracts commercially unviable.

This is not a temporary operational gap. It reflects decades of infrastructure complacency during which Hormuz transit was treated as a permanent given rather than a strategic vulnerability. Twelve million barrels of Gulf crude production per day have been effectively stranded since the blockade began. Gulf states, paradoxically, are among those most economically exposed to a waterway they share with their primary adversary.

The Clean Energy Paradox

The disruption carries a dimension that has received insufficient attention: Hormuz is not merely an artery for fossil fuels. Critical minerals essential to battery supply chains  the raw inputs for the clean energy transition  also flow through it. Aluminium, fertilizer precursors, helium for medical and industrial applications, and an array of goods that underpin both the carbon economy and its intended replacement all transit the same two-mile shipping lanes. The IEA’s own analysis in May 2026 flagged the compound risk: the same chokepoint vulnerability that threatens oil security also threatens the mineral flows that energy transition depends upon. Nations seeking to accelerate away from hydrocarbons are discovering that the infrastructure of that transition runs through the same geography.

China’s Quiet Architecture

Of the 187 commercial vessels that successfully transited Hormuz in the weeks following the initial blockade, more than half were operated by companies from just four countries. China sat at the top of that list  not by accident. Beijing pressed Tehran to protect Chinese shipping early in the crisis, and the IRGC’s tiered access system, which permits passage to countries deemed “non-hostile,” has effectively granted China a commercial advantage that no Western nation currently enjoys.

Simultaneously, China and Russia vetoed the UN Security Council resolution calling for an end to Iranian attacks on shipping. The geometry of this is not subtle. China gains preferential maritime access while blocking the international legal mechanism that would restore access for its competitors. It is a position of extraordinary strategic efficiency.

What Comes After

The memorandum of understanding signed on 17 June sets a 60-day clock toward formal conflict resolution. But the UAE’s state energy company has already estimated that full shipping flows will not normalise until 2027 at the earliest, even under an optimistic settlement scenario. Wood Mackenzie projects a global GDP growth rate below 2% for 2026 if the ceasefire holds but the strait remains largely closed through the third quarter  what analysts are calling “permanent economic scarring” against the pre-war baseline.

The deeper question, though, is structural. The world has now witnessed what a sustained Hormuz closure actually looks like. The answer is: a 95% collapse in crude oil transits, 20,000 stranded mariners, food insecurity cascading across South Asia, a European energy sector pivoting back to Russian LNG, and a legal framework for freedom of navigation placed under greater pressure than at any point since it was codified.

Themistocles was right about sea power. What he could not have foreseen is the modern version of commanding the sea: not a fleet, but a tollbooth  and the fragile consensus of international law that either stands between us and one, or does not.

The ceasefire between the US and Iran remains in effect as of late June 2026, with negotiations ongoing. Oman has established a temporary corridor through the strait in coordination with the IMO, and traffic is cautiously resuming.