Washington revokes the oil licence at the centre of the deal

Hours after the three tankers were struck, the United States revoked the licence authorising the sale of Iranian oil that had been granted under the interim agreement, reversing one of the memorandum's core economic provisions.

Why this matters. Sanctions relief was what Iran was paid with. Withdrawing it removed the only incentive holding the 60-day framework together, which is why the collapse followed within a day.