U.S. President Donald Trump has paused all military aid to Ukraine.

President has been clear that he is focused on peace. We need our partners to be committed to that goal as well. We are pausing and reviewing our aid to ensure that it is contributing to a solution," said the official, speaking on the condition of anonymity.

Mr. Zelenskyy's office did not immediately respond to a Reuters request for comment outside office hours.

The move comes after Mr. Trump upended U.S. policy on Ukraine and Russia upon taking office in January, adopting a more conciliatory stance towards Moscow — and after an explosive confrontation with Mr. Zelenskyy at the White House on Friday in which Trump criticized him for being insufficiently grateful for the Washington's backing in the war with Russia.