Under Article 34 of the
United Nations Convention on the Law of the Sea, the regime of waters forming a strait used for international navigation does not affect the right of
transit passage, which coastal states may neither suspend nor condition on prior authorization. On 1 May 2026, the United States
Office of Foreign Assets Control (OFAC) issued an advisory warning that payments to Iran for passage through the strait exposed both US and non-US persons to sanctions risk. The advisory specified that the risk applied regardless of payment method, including cash, digital assets, in-kind transfers, and charitable donations to Iranian-linked entities such as the Iranian Red Crescent Society. Non-US firms facilitating such payments were warned of potential secondary sanctions, including restrictions on access to the US financial system. Industry analysts noted that compliance with the PGSA permit process, where it involved transit payments, could itself trigger sanctions exposure for shipping companies. Richard Meade of
Lloyd's Intelligence told
CNN that the new system appeared designed to "formalize" Iranian authority over transits through the strait. ==See also==