The unilateral ceasefire coincides with the celebrations in Moscow for the 80th anniversary of victory over Nazi Germany in World War II, Russia’s biggest secular holiday. Kyiv has pressed for a longer-term cease-fire.

Ukraine has expressed readiness to accept a U.S. proposal to enact an immediate, interim 30-day ceasefire, which could be extended by mutual agreement of the parties, and has accused the Kremlin of ignoring the plan. Putin has proposed a ceasefire of only three days - from May 8-10.

Three-day ceasefire in Ukraine that was unilaterally declared by Russian President Vladimir Putin last month was set to come into effect at 5 p.m. ET on Wednesday (midnight Moscow time), as Russia prepares to mark the anniversary of its World War II Victory Day on Friday.