Many Russian soldiers say they would see a cease-fire along the current front lines as a failure, hinting at the nationalist discontent the Kremlin could face in accepting a cease-fire.

Russia and Ukraine agreed to exchange 1,000 prisoners of war each during peace talks held in Istanbul on Friday, in what would be the biggest prisoner swap of the conflict. The negotiations, which lasted less than two hours and were mediated by Turkey, marked the first time the nations have engaged in direct peace talks since the war began.

After dangling the possibility of his attendance, Trump said he would stay away but still wants to meet with Putin, further weakening the Istanbul talks.