The increasingly combative rhetoric shows that despite progress in negotiations, neither Washington nor Tehran appears convinced that the confrontation is over.

Iranians have pleaded for Donald Trump to resume the war and say they have lost hope in the US President as he prepares to make a deal with Tehran.

Iran says return to war unlikely, but Trump 'not satisfied' with deal

Iranian leaders have all scoffed at suggestions that a deal is close, pledging that they’re always ready for a return to fighting.