The U.S. blockade on Iranian ships on the Strait of Hormuz would "remain in full force and effect until an agreement is reached, certified, and signed", ‌Trump wrote on Truth Social.

The Reuters Iran Briefing newsletter keeps you informed with the latest developments and analysis of the Iran war. Sign up here.


Negotiations were progressing and the U.S. relationship with Iran had become more professional and productive, he said. But he added: "Both sides must take their time and get it right. There can be no mistakes!"

A day earlier, Trump said Washington and Iran had "largely negotiated" a memorandum of understanding on a peace deal that would reopen the Strait of Hormuz, which before the conflict carried one-fifth of global oil and liquefied natural gas shipments.

Trump has repeatedly played up the prospect of an agreement to end the war that ​the U.S. and Israel started on February 28.

It was not clear whether the agreement he was referring to on Sunday was the interim memorandum of understanding that has been under discussion, or a much more ​challenging final peace settlement, likely to take much longer.