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.

MOSCOW (Reuters) -Primary oil processing at Russia's Novokuibyshevsk refinery, which is operated by the Rosneft oil company, has been halted since August 2 following a Ukrainian drone attack last week,

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.