U.S. President Donald Trump said Russian President Vladimir Putin had "really let me down,” but insisted allies must stop purchasing oil from Russia if they want the U.S. to further intervene and pressure the Kremlin to end the war in Ukraine.

"Very simply, if the price of oil comes down, Putin is going to drop out,” Trump said Thursday following a meeting with U.K. Prime Minister Keir Starmer. "He’s going to have no choice. He’s going to drop out of that war.”

While Trump said he’d be willing to consider other efforts to punish Putin, he signaled that those moves would be contingent on allies ending purchases of Russian energy.