President Trump "wants to see a permanent ceasefire first, to stop the killing, stop the bloodshed," press secretary Karoline Leavitt said.

Russian President Vladimir Putin on Monday declared a unilateral three-day ceasefire in Ukraine next month, a move met with skepticism by Ukrainian officials who demanded the Kremlin leader immediately accept a longer truce proposal from the United States that he has so far rejected.

President Donald Trump is "increasingly frustrated" by the leaders of Ukraine and Russia, and wants Russian President Vladimir Putin to go further than his declaration of a temporary ceasefire, the White House said.