"Any act of aggression will have severe consequences, for which the U.S. will bear full responsibility," Iranian Permanent Representative to the United Nations Amir Saeid Iravani wrote in a letter to U.

Under former President Joe Biden, the U.S. and the United Kingdom began a series of airstrikes against the Houthis starting in January 2024. A December report by The International Institute for Strategic Studies said the U.S. and its partners struck the Houthis over 260 times up to that point.

The Iranian-backed rebels, who have targeted Israel and shipping in the Red Sea, said children were among those killed in the strikes ordered by President Trump.