The call, scheduled for Tuesday, will be the first known conversation between the two leaders since Mr. Putin laid out numerous conditions for a cease-fire with Ukraine.

U.S. President Donald Trump said he would speak to Russia's Vladimir Putin on Tuesday morning about ending the Ukraine war, with territorial concessions by Kyiv and control of the Zaporizhzhia nuclear power plant likely to feature prominently in the talks.

Putin said he was "for" a ceasefire but raised concerns and set out his own conditions, such as certain security guarantees. Ukrainian President Volodymyr Zelenskyy, meanwhile, has accused the Russian leader of obstructing peace and "prolonging" the war.