Lukoil's Ukhta facility in Komi Republic was struck in what appears to be the longest confirmed drone attack of the war, as footage showed thick black smoke rising over the facility.
Emergency crews deployed over 150 rescuers to extinguish simultaneous industrial fires in two Russian oblasts on 7 June, with blazes consuming a bitumen production facility near a major Lukoil refinery and a fuel storage depot outside Moscow.
Ukrainian drones have recently struck oil refineries operated by major producers Lukoil and Rosneft, raising concerns over Russia's ability to sustain fuel production.
Russian officials emphasized the incident resulted from technical issues rather than external factors, however local residents reported hearing an explosion.