What happened

A fire broke out in the RVS-10000 storage tank at Lukoil's Ukhta refinery during scheduled technical work, killing two workers and sending four more to hospital with burns and smoke-inhalation injuries. Regional officials said the fire was caused by non-compliance with safety regulations rather than a drone strike, and a commission was established to investigate. This was an accidental industrial incident, not an attack; the same refinery was targeted by drone strikes at other points during the war.

When cited sources give different casualty, damage or spill figures for this event, they’re reported side by side above rather than merged into one number. See how confidence levels work.