The cancellation of talks raised questions about an initial agreement to end the war in Iran.
The U.S and Iran have traded strikes for a second day, pushing the Middle East closer to the resumption of a full-scale war.
The crash occurred with the Middle East still reeling after Iran and Israel exchanged fire the previous day.
The U.S. military said Iran fired missiles at Kuwait, which fell apart en route, and downed drones targeting American forces.
Iran has fired on three ships in the Strait of Hormuz and seized two of them.
Negotiators from Iran and the U.S. are preparing for high-level talks amid a shaky ceasefire.
A tentative ceasefire in the Iran war is under strain due to Israel’s bombardment of Beirut and Tehran’s continued control over the Strait of Hormuz.
Trump has warned Iran that the U.S. could set the country 'back to the stone ages,' including targeting power plants and bridges.
Two U.S. military planes were shot down in separate incidents on Friday, escalating tensions in the ongoing conflict.
It would mark the first time the U.S. has lost aircraft in Iranian territory and marks a dramatic escalation in the war since it began five weeks ago.