Trump added that he thinks it is unlikely the deal will not be complied with, but if not, then the "Shootin' Starts, bigger, and better, and stronger than anyone has ever seen before," he wrote.
All US military personnel and equipment will "remain in place in, and around, Iran" until Tehran complies with the ceasefire agreement, US President Donald Trump wrote on Truth Social late Wednesday night.
"All US Ships, Aircraft, and Military Personnel, with additional Ammunition, Weaponry, and anything else that is appropriate and necessary for the lethal prosecution and destruction of an already substantially degraded Enemy, will remain in place in, and around, Iran, until such time as the REAL AGREEMENT reached is fully complied with," he wrote.
"If for any reason it is not, which is highly unlikely, then the 'Shootin’ Starts,' bigger, and better, and stronger than anyone has ever seen before," he threatened.
"It was agreed, a long time ago, and despite all of the fake rhetoric to the contrary - NO NUCLEAR WEAPONS and, the Strait of Hormuz WILL BE OPEN & SAFE," he stated.
"In the meantime, our great Military is Loading Up and Resting, looking forward, actually, to its next Conquest. AMERICA IS BACK!" the post concluded.
Iran: 'Unreasonable' to forge permanent deal while Israel strikes Hezbollah in Lebanon
Iran had said earlier on Wednesday that it would be "unreasonable" to proceed with talks to forge a permanent peace deal with the United States after Israel pounded Lebanon with its heaviest strikes yet on Wednesday, killing hundreds of people.
The two sides appeared to be far apart on Iran's nuclear program, with Trump saying Iran had agreed to stop enriching uranium, and Iran's Parliament Speaker, Mohammed Bagher Ghalibaf, saying it was allowed to continue enriching uranium under the terms of the ceasefire.
Reuters contributed to this report.