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.

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.

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.