Iran Press/ Europe: The refinery, one of southern Russia's largest oil refineries, said that Ukrainian drones attacked it, and the attack set off a massive fire.
"As a result of actions from the western border of the Rostov region, two unmanned aerial vehicles (UAVs) attacked the technical facilities" of the plant, the Novoshakhtinsk refinery said in a statement. It added that as a result, "an explosion occurred, starting a fire."
The Novoshakhtinsk refinery is reported to be one of the largest in southern Russia, with a capacity of up to 7.5 million tons per year.
In April, the latest attack followed explosions and fire at the key Transneft-Druzhba oil depot in Russia's Bryansk region, less than 100 kilometers from the Ukraine border.
Ukraine has not claimed responsibility for the attacks on Russian territory but has not formally denied being behind them.
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