Intense Russian air attack on Ukraine's capital kills four

Russia mounted an intense missile and drone barrage of the Ukrainian capital overnight, killing four people, Ukrainian officials said, as powerful explosions reverberated across the city. The attack followed a warning from Russian President Vladimir Putin, conveyed via U.S. leader Donald Trump, that the Kremlin would hit back after Ukrainian drones destroyed several strategic bomber aircraft in attacks deep inside Russia. Kyiv mayor Vitali Klitschko said 20 people were injured, 16 of them in hospital, in addition to the four deaths. The city's metro transport system was disrupted by a Russian strike that hit and damaged a train between stations, Kyiv's military administration said. In the Solomenskiy district, a Russian drone slammed into the side of apartment building, leaving a gaping hole and burn marks, a Reuters photographer at the scene said.