More than 120 firefighters were trying to extinguish a blaze at an oil depot in the Russian city of Sochi that was sparked by a Ukrainian drone attack, regional Governor Veniamin Kondratyev said early on Sunday on the Telegram messaging app.

During the night of August 5, Russia launched a massive attack on Ukraine using ballistic missiles and nearly fifty drones, most of them Iranian-made Shaheds, according to President Volodymyr Zelenskyy.

Russia's Ryazan oil refinery halved its production and the Novokuibyshevsk refinery halted it completely on Aug. 2 after Ukrainian drone attacks, Reuters reported, citing undisclosed sources.