Ukrainian air defenses largely repelled a heavy Russian missile attack overnight, Kyiv says. European leaders are gathering for a Council of Europe summit, the first in years, to discuss the war.
Russia launched a fresh wave of air attacks, the eighth in May, on the Ukrainian capital early on Tuesday.
Ukrainian officials said defense systems had shot down objects over several districts of Kyiv, although Russian defense officials later said they had hit all targets overnight.
The night attack was complex, with drones, cruise, and likely ballistic missiles launched from different directions, Kyiv officials said.
"It was exceptional in its density: the maximum number of attack missiles in the shortest period of time," Serhii Popko, head of Kyiv's city military administration, said in comments posted on the Telegram messaging app.
"According to preliminary information, the vast majority of enemy targets in the airspace of Kyiv were detected and destroyed!" he added.
Ukrainian Defense Minister Oleksii Reznikov said in a tweet that "our sky defenders shot down six Russian hypersonic Kinzhal missiles and 12 other missiles" during the Russian attacks.
Kyiv Mayor Vitali Klitschko earlier said falling debris set several cars on fire and damaged a building in the Solomyanskyi district in the capital's west, which appeared to be the hardest hit. Three people were injured.
Two cars caught fire in the city's southeastern Darnytskyi district, he added. Debris also fell on the city's zoo in the Shevchenkivskyi district.
Kyiv's military administration said falling debris was reported in the capital's Obolonskyi, Shevchenkivskyi, Solomyanskyi and Darnytskyi districts.
After a weekslong hiatus, Russia in late April resumed its tactic of long-range missile strikes and has launched a flurry of attacks in recent days, often targeting Kyiv.
Nearly all of Ukraine was under air raid alerts in early hours of Tuesday.
The latest attacks came just hours after Ukrainian President Volodymyr Zelenskyy returned from a Europe trip aimed at securing new weapons for a planned counteroffensive against Russia.
