Russia launched its largest drone and missile bombardment of Ukraine overnight into Wednesday, according to Ukrainian President Volodymyr Zelenskyy.

Hours later, Russia launched a glide bomb and a drone at the front-line town of Kostyantynivka in eastern Ukraine, killing four civilians and injuring a fifth, the prosecutor’s office said. The drone struck a car in which a married couple were travelling, killing the 39-year-old woman and 40-year-old man on the spot, it said.

Russia has unleashed over 700 explosive-laden UAVs in a coordinated attack on Ukraine. The unprecedented swarm targeted key infrastructure and urban centers, leaving large parts of Kyiv and Lutsk engulfed in flames and smoke.