Iran’s first vice president went on state television in mid-May 2026 and made a claim that no amount of diplomatic language can soften: the Strait of Hormuz, he said, “has always been our property,” and Tehran will not give it up “at any price.”
Mohammad Reza Aref’s declaration was not a stray comment. Within hours, Iranian Foreign Minister Abbas Araghchi announced that all commercial ships entering the strait must cooperate with Iran’s navy. A vessel seized off the coast of the United Arab Emirates was directed into Iranian waters, as the Associated Press reported, though the vessel’s name and flag state have not been confirmed in available reporting.
The coordinated sequence turned what might have been dismissed as bluster into something more concrete: a direct challenge to the legal order governing the world’s most important energy chokepoint.
Why Hormuz matters more than any other waterway
Roughly 20 million barrels of oil pass through the Strait of Hormuz every day, according to the International Energy Agency. That is approximately one-fifth of all seaborne oil traded globally and dwarfs the volume moving through the Suez Canal or the Malacca Strait.
The bulk of that crude heads to Asia. China, Japan, South Korea, and India all depend heavily on tankers transiting Hormuz. Any sustained disruption would tighten supply for those economies within days and send benchmark crude prices sharply higher. Even the perception of risk in the strait tends to spike shipping insurance premiums and freight rates, costs that eventually filter down to consumers at the pump.
What Aref and Araghchi actually said
Aref told viewers the strait “belongs to Iran” and that Tehran would not surrender it “at any cost.” In a closely timed statement carried by the Iranian Students’ News Agency, he added: “Our right to the Strait of Hormuz is established, and the matter is closed,” according to Iran International.
The consistency of the language across separate state-affiliated outlets suggests a coordinated messaging campaign, not an improvised remark. Araghchi’s directive about naval “cooperation” added an operational layer to the sovereignty rhetoric, though neither he nor other officials specified what cooperation means in practice. It could range from advance identification protocols to mandatory inspections or escort requirements.
One vessel seizure near the UAE coast has been confirmed by the Associated Press, but the vessel’s name and flag state have not been disclosed in available reporting. There is no verified data yet on whether additional ships have been stopped, delayed, or rerouted since the announcement.
The legal problem with Iran’s claim
International maritime law does not support the idea that any single country owns the Strait of Hormuz. Under the UN Convention on the Law of the Sea, coastal states may claim a territorial sea extending up to 12 nautical miles from their shores. But UNCLOS Part III, which governs straits used for international navigation, requires that transit passage remain open to all vessels. The International Maritime Organization has separately affirmed that freedom of navigation is a fundamental principle of international maritime law.
There is a significant wrinkle, however. Iran has never ratified UNCLOS. Tehran could argue that the convention’s transit passage regime does not legally bind it. In practice, though, most legal scholars consider transit passage through international straits to be a norm of customary international law, meaning it applies regardless of whether a state has signed the treaty. Iran’s framing of Hormuz as sovereign territory contradicts both the convention and the customary norm.
What is still missing
For all the force of Aref’s language, Tehran has not published a formal government decree, foreign ministry legal brief, or treaty notification to back up the claim. Without such a document, it is difficult to determine whether Iran is asserting full sovereignty over the entire strait, demanding expanded territorial waters, or simply insisting on de facto operational control over vessel traffic.
The diplomatic picture is equally incomplete. The Guardian has reported that Gulf states urged the UN Security Council to act and that a draft resolution on Gulf navigation is circulating, but these claims could not be independently verified from the source provided. The resolution’s text, its sponsors, and the timeline for a vote have not been disclosed. A prior veto on a related measure has been referenced without full detail on which council member exercised it or on what grounds.
Market data is also lagging behind the rhetoric. Neither the IEA nor the IMO has released real-time figures on vessel transits or delays through Hormuz since Aref’s statement. Until that information surfaces, the actual impact on shipping flows is hard to quantify beyond the general risk that a fifth of the world’s seaborne oil could face interference.
The pattern Tehran has followed before
Iran has threatened to close or restrict the Strait of Hormuz multiple times over the past four decades. During the 1980s Tanker War, Iranian forces attacked commercial shipping in the Gulf. In 2011 and 2012, senior military officials warned they could shut the strait in response to Western sanctions. In 2019, Iran’s Islamic Revolutionary Guard Corps seized a British-flagged tanker, the Stena Impero, in a standoff that rattled oil markets for weeks.
In every case, Tehran used maximalist language to signal resolve, rally domestic opinion, and gain leverage in negotiations, while stopping short of a full blockade that would almost certainly trigger a military response from the United States and its allies. The U.S. Fifth Fleet, headquartered in Bahrain, maintains a permanent naval presence in the Gulf, and Washington has historically treated freedom of navigation through Hormuz as a core security interest.
That pattern does not guarantee restraint now. But it does suggest that Aref’s assertion should be read as part of a broader political strategy rather than as an immediate legal redefinition of the waterway. The coordinated timing of his comments with Araghchi’s operational language about naval cooperation points to a two-level message: domestically, projecting uncompromising sovereignty; internationally, testing how far Iran can push de facto control over shipping without provoking a direct confrontation.
What comes next at the Strait of Hormuz
For energy importers, shipping companies, and governments with naval assets in the Gulf, the weeks ahead in May and June 2026 will be defined by what Iran does, not what it says. If Tehran follows its historical playbook, the rhetoric will remain hot while actual interference with shipping stays limited and selective. If it escalates to systematic inspections, escort demands, or additional seizures, the calculus changes fast.
The UN Security Council process will be a key signal. A strong resolution affirming transit passage rights would put diplomatic weight behind the legal baseline. A vetoed or watered-down resolution would leave Gulf states and their allies to enforce navigation norms on their own, raising the risk of a direct confrontation at sea.
What can be said with confidence right now is narrow but important: Tehran’s latest claims run against established maritime law, the economic stakes are enormous, and even the perception of risk in this 21-mile-wide waterway is enough to unsettle global energy markets. The gap between Iran’s words and its actions is where the real story will unfold.
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*This article was researched with the help of AI, with human editors creating the final content.
