Russian President Vladimir Putin has proposed holding “direct talks” with Ukraine on May 15 in Istanbul, as European leaders and the United States attempt to put pressure on Moscow to agree to a 30-day ceasefire in order to bring an end to the three-year conflict.

In a rare, late-night television address from the Kremlin on Saturday, Putin told Russians, “We seek serious talks... to remove the root causes of the conflict and start moving toward a lasting, strong peace,” adding that the talks should ”start without delay, as early as May 15.”

European leaders from Britain, France, Germany and Poland joined Ukrainian President Volodymyr Zelensky in Kyiv in urging Russian President Vladimir Putin to accept a 30-day ceasefire or face more sanctions.