Iran's military announced Saturday it had closed the Strait of Hormuz, citing continued Israeli attacks in southern Lebanon and US violations of a new interim war agreement. The US military immediately disputed this claim — VP Vance said the strait is actually open and 55 ships had passed through Saturday — but the announcement itself is confirmed by multiple outlets and occurs just hours before US-Iran negotiations resume in Switzerland. The real issue is whether Iran can enforce a closure or is using the announcement as pressure leverage in ongoing ceasefire talks with the Trump administration.