An overnight Ukrainian drone attack on an oil depot near Russia`s Black Sea resort of Sochi sparked a major fire, Russian officials said on Sunday, as the two countries traded strikes and the Ukrainian president announced a prisoner exchange. More than 120 firefighters attempted to extinguish the blaze, which was caused by debris from a downed drone striking a fuel tank, Krasnodar regional Governor Veniamin Kondratyev said on Telegram. 

Videos on social media appeared to show huge pillars of smoke billowing above the oil depot. Russia`s civil aviation authority, Rosaviatsia, temporarily stopped flights at Sochi`s airport. Farther north, authorities in the Voronezh region reported that four people were wounded in another Ukrainian drone strike.

Russia`s Defence Ministry said its air defences shot down 93 Ukrainian drones over Russia and the Black Sea overnight into Sunday. Meanwhile, in southern Ukraine, a Russian missile strike hit a residential area in the city of Mykolaiv, according to the State Emergency Services, wounding seven people.