Russia launched fresh drone and missile attacks on Ukraine overnight, including shortly after a ceasefire announced by Kyiv came into force, according to Ukrainian authorities.
Both Moscow and Kyiv separately declared unilateral ceasefires on Monday ahead of Russia marking the anniversary of the Soviet Union's victory over Nazi Germany during World War II on Saturday.
The Kremlin said it would observe a two-day ceasefire with Ukraine on May 8 and 9, and Russia's defense ministry said it expected Ukraine "to follow suit."
Ukrainian President Volodymyr Zelensky said the country would instead observe a ceasefire from midnight on May 6 into Wednesday, with the Ukrainian military acting "symmetrically" to Russia.
Ukraine's air force said early on Wednesday that Russia had attacked the country with three ballistic missiles and more than 100 drones overnight.
Minutes after Ukraine's ceasefire came into effect, Ukrainian authorities in the southern Zaporizhzhia region issued air raid warnings, including for Russian strikes using destructive aerial bombs guided by lasers.
One person was killed in Ukraine's northern Sumy region after a Russian bomb hit a car early on Wednesday, according to Sumy regional governor Oleh Hryhorov.
Hryhorov later said two Russian drones had hit a civilian building in central Sumy.
Ihor Terekhov, the mayor of the northeastern Ukrainian city of Kharkiv, said several homes had been damaged after a Russian drone hit a house early on Wednesday, causing a fire. Ukraine's state emergency service said two people were injured in the "morning attack."
Ukraine's foreign minister Andrii Sybiha said Russia had violated the ceasefire and "once again ignored a realistic and fair call to end hostilities." Newsweek has contacted the Russian Defense Ministry for comment via email.
In its own statement early Wednesday, the Russian government said its air defenses had intercepted 53 Ukrainian drones over Russian and annexed territory between 9 p.m. Moscow time on Tuesday and 8 a.m. on Wednesday.
Russia had pledged to launch a "retaliatory, massive missile strike on the center of Kyiv" if Ukraine targeted Russia's commemorations on Saturday.
The Kremlin had announced it would scale back its annual military parade for Victory Day to "minimize the danger" of attacks from Ukraine.
"It is time for Russian leaders to take real steps to end their war, if the Russian Ministry of Defense believes that it will not hold a parade in Moscow without the goodwill of Ukraine," Zelensky said on Monday.
Ukrainian authorities said at least 12 people were killed and another 43 injured in a Russian attack on the city of Zaporizhzhia on Tuesday, just ahead of Ukraine's declared ceasefire.
Russia had struck industrial facilities in the southern city, according to the local governor.