What happened

A Ukrainian drone attack and resulting fire struck the Kuibyshev oil refinery in Samara, stopping its CDU-5 crude-distillation unit — roughly half the plant's processing capacity (about 70,000 of 140,000 bbl/d), per Russian regional officials.

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.