Russian drones and missile strikes hit Kharkiv on Monday, knocking out power to 80% of Ukraine's second-largest city and the surrounding region and striking apartment buildings, a school and a kindergarten, local officials said. Two people were injured, regional governor Oleh Syniehubov said in a video posted on Telegram. Mayor Ihor Terekhov said an energy site had been targeted in the city as night-time temperatures dipped to -14C.