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Iran moved decisively on Sunday to formalize what had been a de facto blockade: the Islamic Revolutionary Guard Corps Navy officially declared the Strait of Hormuz closed “until further notice,” citing U.S. interference in West Asia. The announcement followed Iran’s rejection of a 24-hour ultimatum issued by President Trump — which demanded Tehran publicly guarantee free passage through the waterway and cease attacks on commercial vessels — a condition Iran’s leadership dismissed without issuing a formal response, instead letting its missiles speak.

The escalation sequence as CDM understands it: Trump issued the ultimatum. Iran closed the Strait and struck a Cypriot-flagged vessel in Omani waters, calling it an “unauthorized” ship. The U.S. launched what Naked Capitalism, citing analyst Brandon Weichert, described as its most intense strike package since the war began — a profile some read as preparation for a potential ground operation. Kuwait and Bahrain participated in the U.S.-led strikes, meaning two Gulf monarchies are now co-combatants against Iran. Iran retaliated with missiles and drones against Qatar, UAE, Bahrain, Kuwait, Oman, and Jordan. Qatar’s foreign ministry called the barrages a “dangerous escalation” and ordered all marine vessel owners to suspend navigation in its waters. Overnight U.S. strikes killed at least one Iranian Navy lieutenant at the port of Jask.

The counter-narrative on shipping: Despite Iran’s declaration, the UK Maritime Trade Operations (UKMTO) stated Sunday that the southern Oman-side route remains open and has been expanded to accommodate two-way traffic. This sets up a direct contest of authority over the waterway: Tehran declares it closed; the U.S. and UK say the southern corridor is operational. Iran’s Foreign Minister Araghchi met Omani Foreign Minister Badr Albusaidi in Muscat to discuss safe passage “mechanisms” — suggesting Tehran is simultaneously escalating and, through back-channels, trying to preserve a face-saving arrangement that protects Oman’s role as intermediary.

CDM read: Iran is threading a needle — firing on Gulf states to demonstrate resolve while simultaneously negotiating Hormuz transit terms through Oman. Trump, who left the ceasefire door open even while declaring it over, appears to be doing the same. The question is whether the UKMTO’s expanded southern route can handle enough tonnage to prevent a genuine energy supply shock. It cannot — the main channel, not the Oman coastal lane, carries the bulk of the 17-21 million barrels per day that normally transit the Strait.

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