Russia will announce who is attending proposed peace talks in Turkey on ending the war in Ukraine when President Vladimir Putin sees fit to, the Kremlin said on Tuesday, declining to say at this stage whether or not Putin will attend himself.

Putin’s proposal came after leaders from four major European countries threatened to ratchet up pressure on Moscow if it does not accept an unconditional 30-day ceasefire in Ukraine.

President Volodymyr Zelenskyy echoed calls for a ceasefire from Europe and the United States, saying Ukraine will attend negotiations proposed by Russian President Vladimir Putin later this week.