Falling debris from destroyed drones sparked fires at residential buildings in Kyiv's Obolonskyi and Sviatoshynskyi districts, Timur Tkachenko, head of Kyiv's military administration, said on social media on Sunday.
Ukraine's emergency service said on the Telegram messaging app that 76 firefighters were involved in putting out the overnight fires in Kyiv, which also included a small blaze in Kyiv's central Shevchenkivskyi district.
It posted photos of firefighters battling large blazes at night at what seemed like a residential building.
The emergency service also said that several cars across the city caught fire from falling drone debris.
Reuters' witnesses heard several explosions in what sounded like air defence systems in operation.
There was no immediate information on the full scale of the attack.
Kyiv, its surrounding region and the eastern half of Ukraine were under air-raid alerts for about an hour, starting soon after midnight, early on Sunday local time.
There was no immediate comment from Moscow about the attack amid uncertainty over whether both sides would stop war activities during Moscow's commemorations of the victory of the Soviet Union and its allies in World War Two this week.
Last week Russia declared a three-day ceasefire from Thursday to Saturday to which Kyiv responded with a proposal to stop war activities for 30 days.
Both Russia and Ukraine deny targeting civilians in the war that Russia started more than three years ago with a full-scale invasion of Ukraine.
Ukraine President Volodymyr Zelenskiy said Ukraine was preparing for foreign policy meetings to try and negotiate a ceasefire.
"We are ready to move toward a ceasefire even starting today, if Russia is ready to take reciprocal steps: complete silence, a lasting ceasefire of at least 30 days," he said on X.
"That's a fair timeframe to prepare the next steps. Russia must stop the war—halt its assaults and shelling."
