The Kremlin said the 72-hour ceasefire would run for three days either side of May 9.
A senior Russian military officer, Yaroslav Moskalik, was killed in a car explosion in Balashikha, near Moscow.
The incident is being investigated by law enforcement in the Kharkiv region.
The Kremlin chief signed the agreement with Iranian President Masoud Pezeshkian in January.
Second antisemitic incident in a week • Security upgrades prevented a major disaster during Passover
The war in Ukraine has been going on for three years and large number of prisoners have been taken on both sides.
Russian President Vladimir Putin declared a unilateral Easter ceasefire in Ukraine, ordering his forces to end hostilities on Saturday until the end of Sunday.
Outside the White House, protesters carried banners that read "Workers should have the power," "No kingship," "Stop arming Israel" and "Due process," media footage showed.
This comes after Donald Trump told reporters that he would walk away from negotiations if he thought either party was hindering the agreement.
EUROPE AFFAIRS | "Russia only understands the language of force,” Maj.-Gen. Vadym Skibitsky told the 'Post.'
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