President Vladimir Putin’s conditions for ending the war in Ukraine include a demand that Western leaders pledge in writing to stop enlarging NATO eastwards and lift a chunk of sanctions on Russia, according to three Russian sources with knowledge of the negotiations. U.S. President Donald Trump has repeatedly said he wants to end the deadliest European conflict since World War Two and has shown increasing frustration with Putin in recent days, warning on Tuesday the Russian leader was “playing with fire” by refusing to engage in ceasefire talks with Kyiv as his forces made gains on the battlefield.