Twenty-one other drones were "lost," and five more flew back towards Russia, it added.Debris from downed drones damaged residential buildings and an office building in Kyiv during an hours-long attack, local authorities said.Russian forces also reportedly fired a Kh-31P cruise missile against Ukraine overnight.Two S-400 missiles hit a police station in Kharkiv, killing police officer Andrii Matvienko. Thirty-six police officers, nine civilians, and one rescuer were injured in the attack, according to the Interior Ministry.The strikes damaged 20 residential buildings, as well as heating and water supply networks, and 19 vehicles, local authorities said.Russian forces also attacked a five-story residential building in the town of Kupiansk in Kharkiv Oblast, injuring a 44-year-old man and two women aged 68 and 75, according to Governor Oleh Syniehubov.A Russian drone also hit a residential building in the city of Sumy.