Russia and Ukraine swapped accusations of breaking a U.S.-brokered ceasefire on Sunday, with both sides claiming to have suffered casualties in drone and artillery strikes over the past 24 hours.

A Russian drone hit a high-rise residential building in Ukraine's second-largest city, authorities said, injuring at least five people and straining a three-day cease-fire timed for Victory Day celebrations.

Russian drone and missile strikes killed at least 22 people and wounded more than 80 across Ukraine, as President Volodymyr Zelenskyy blasted Moscow’s “absolute cynicism."

Kyiv said it would begin a truce on 6 May and then "act symmetrically" after Moscow declared a pause for its Victory Day parade.

He said he hoped the pause represented “the beginning of the end of a very long, deadly, and hard fought War.” Zelensky and the Kremlin confirmed the truce as part of on-and-off U.S. efforts to negotiate an end to the conflict.