Ukraine drone strike shuts key unit at Russia’s NORSI refinery

Russia’s NORSI refinery has shut its main crude distillation unit after a Ukrainian drone strike, knocking out the plant’s most important processing line at a site that handles about 16 million metric tons of oil a year, or roughly 320,000 barrels a day.

Two industry sources with direct knowledge of the situation said the CDU-6 unit was taken offline after the attack, a hit that matters well beyond the fence line in Kstovo, in Nizhny Novgorod Oblast. CDU-6 accounts for 53 percent of the refinery’s overall capacity and can process about 25,700 metric tons a day, making its loss a sharp blow to output at Russia’s fourth-largest oil refinery.

Ukraine’s General Staff said its forces struck the Lukoil-Nizhegorodnefteorgsintez refinery near Kstovo overnight on May 20, and several reports said the strike triggered a fire at the site. Russian officials acknowledged a fire at the industrial facility but gave limited technical detail. The refinery sits about 450 kilometers east of Moscow, deep inside territory that has increasingly come under pressure from long-range Ukrainian drones.

The strike was described in multiple reports as the second hit on the Kstovo refinery in about a week, underscoring a sustained campaign against Russian energy infrastructure rather than a one-off disruption. The repeated attacks have begun to reshape the downstream side of the war, where refining capacity, fuel logistics and export flows all matter as much as battlefield advances.

Reporting in recent days has said virtually all major refineries in central Russia have been forced to halt or reduce output after drone attacks in May, including plants in Kirishi, Moscow, Ryazan, Yaroslavl and Nizhny Novgorod. One report said the Kirishi refinery, one of Russia’s largest, had been completely shut since May 5. Other estimates put the affected plants at more than 30 percent of Russia’s gasoline production and about 25 percent of its diesel output.

That scale makes the Kstovo outage more than a local industrial fire. Each new shutdown increases the risk of tighter domestic fuel supplies, more pressure on transport and logistics, and a greater strain on Moscow’s ability to keep earning from oil while shielding the infrastructure that turns crude into usable fuel. The pattern also suggests Russia must now devote more resources to defending refineries far from the front, where the economic costs of the war are becoming harder to ignore.