Ihor Terekhov said that overnight Russia launched 48 drones, two missiles and four gliding bombs in an attack he described as "open terror". Some 18 apartment buildings and 13 other homes in Kharkiv were hit overnight during Friday's attack, the city's mayor said. Two people were also killed in Russian strikes on Kherson, in southern Ukraine, local authorities said. The barrages over the past two nights came after Ukrainian drone strikes targeted Russian strategic warplanes at four air bases deep inside Russia. Watch: Drone footage of what Ukraine has said shows Russia airfield attack