Washington identified the attacker within hours. A Singapore-flagged cargo ship, the Ever Lovely, took an Iranian drone to the bridge on Thursday as it exited the Strait of Hormuz, several miles off the coast of Oman. US officials named the perpetrator without hedging: the Islamic Revolutionary Guard Corps. Then, asked what the United States intended to do about it, an official said only that the government was aware of the reports and looking into them.

A shipping lane that hugs the Omani coastline is doing something the IRGC cannot tolerate: it lets tankers leave the Persian Gulf without asking Tehran for permission. Oman, working with the International Maritime Organization, has now formalized a temporary, fee-free corridor through the southern half of the Strait of Hormuz, with explicit navigational coordinates issued jointly by Muscat and the IMO. Muscat frames it as freedom-of-navigation housekeeping. For Iran, it is a structural threat to the one piece of leverage the war left it holding.

The United States has stopped arguing with Iran over who controls the Strait of Hormuz and started prosecuting the transaction itself. On May 27, the Treasury Department added Iran’s Persian Gulf Strait Authority to the Specially Designated Nationals list under Executive Order 13224, the counterterrorism authority reserved for entities that finance terror. The designation does not contest Tehran’s claim to administer the strait. It renders the act of buying passage a sanctionable offense, and in doing so it inverts the entire logic of the toll regime.