Ukrainian President Volodymyr Zelenskiy said on Tuesday that progress in resolving the more than three-year-old war with Russia depended on Russia taking the first step of agreeing to an unconditional ceasefire.

The Kremlin said on Tuesday that Ukraine had not responded to many offers by Russia President Vladimir Putin to start direct peace negotiations.

Russian President Vladimir Putin declared a three-day ceasefire in the war with Ukraine next month to celebrate the Soviet Union’s victory over Nazi Germany during World War II.