The Strait of Hormuz is closed again. Iran’s top joint military command, the Khatam al-Anbiya Central Headquarters, announced the closure on Saturday, just days after the same waterway had reopened under a US-Iran framework agreement signed by Presidents Trump and Pezeshkian. The trigger this time is not the original war. Instead, it is closed on account of continued Israeli strikes on Hezbollah positions in southern Lebanon, which Tehran says violate the ceasefire’s terms.
Closed for business, or not?
In its statement, carried by state broadcaster IRIB, the military command cited “the United States’ bad faith and its clear breach of its commitments by failing to implement the first article of the memorandum ending the war,” alongside “the continuous and ongoing violation of the ceasefire by the Zionist regime in southern Lebanon.” The Islamic Revolutionary Guard Corps Navy followed with a direct warning to commercial shipping, saying vessel safety could not be guaranteed if ships approached the strait.
The timing is pointed. The announcement landed just as US and Iranian negotiators were preparing to reconvene in Switzerland, where Trump’s envoys Steve Witkoff and Jared Kushner had already arrived for a fresh round of talks. Vice President JD Vance, en route to the same talks, told Fox News he saw no evidence the strait was actually closed, pointing to US Central Command data showing roughly 16 million barrels of oil moved through the waterway in the prior 24 hours, numbers he said were back near pre-war levels.
That contradiction, Iran’s declared closure against Washington’s claim of business as usual, has become a pattern. This is not the first time Hormuz has been “closed” only for tankers to keep moving. Since the war began on February 28, Iran has alternated between full closures and selective access, at times reportedly charging tolls as high as $2 million per ship. Industry analysts have noted that even when Iran permits transit, full normalization could take weeks, partly because the threat of mines in the strait still needs to be cleared.
Massive stakes on the high seas
The Strait of Hormuz remains the only sea route out of the Gulf for the region’s major oil producers. In ordinary times, roughly a fifth of the world’s oil and LNG passes through it. A UK-based energy consultancy has called a prolonged shutdown the single greatest risk to both energy markets and the global economy, warning that more than 11 million barrels per day of Gulf oil and over 80 million metric tons of annual LNG supply could turn inaccessible if the closure holds. For now, the closure functions as leverage rather than a hard blockade, Iran’s strongest card in a negotiation it does not want to lose, used to apply pressure exactly when talks are about to resume. Whether the Switzerland round produces enough to de-escalate Lebanon, and with it Hormuz, will likely determine whether this closure is symbolic or the start of something harder to walk back.
