Rosneft’s Kuibyshev refinery halted oil-processing operations on June 10 after a
drone strike damaged equipment and sparked a fire, two industry sources said.
The attack knocked out two atmospheric crude distillation units, CDU-4 and
CDU-5, each with roughly 10,000 mt/day (≈73,000 bpd) capacity — about 20,000
mt/day (≈146,000 bpd) of processing capacity affected.