Deadly Fire Erupts at Russian Oil Refinery During Maintenance

Authorities rule out Ukrainian drone strike, open negligence investigation

Fire at Ukhta refinery in Komi Republic results in multiple deaths and injuries.
Incident occurred during scheduled technical work by a contractor.
Regional governor confirms fire unrelated to recent drone attacks on Russian facilities.
Investigators have launched a criminal case to probe possible negligence.
Images suggest the refinery is owned by oil giant Lukoil.