U.S. President Donald Trump said on Saturday he would speak to the presidents of Russia and Ukraine on Monday following talks between the two sides at which a Ukrainian official said Moscow's negotiators voiced new demands before a ceasefire could be agreed.

In Moscow, Kremlin spokesman Dmitry Peskov told Russian news agencies preparations were underway for a conversation between Russian President Vladimir Putin and Trump.

The talks in Turkey on Friday were the first time the sides had held face-to-face talks since March 2022, weeks after Russia's full-scale invasion of its smaller neighbor.