The US military carried out additional strikes Tuesday on Iran, prompting Tehran to attack Jordan, Bahrain and Kuwait in defiance of a warning from President Donald Trump that Iran would be “hit much harder” if it retaliated.

The latest round of tit-for-tat strikes began after the US and Iran traded attacks overnight into Monday for the first time in over a month, in exchanges that risked reigniting the damaging conflict after weeks of relative military calm.

After the fresh US strikes were announced, Trump warned that Iran would face more severe military action if it retaliated against what he called a “very justified attack.”

“They will be hit again at a much harder and higher level, but it will not be the biggest attack of them all, that is waiting in the wings and, when it is over, there will be very little left of the Islamic Republic of Iran!” he wrote Tuesday on Truth Social.

Iran, however, vowed a “crushing” response and launched ballistic missiles toward Jordan and drones toward Bahrain and Kuwait, saying it was targeting US military assets.