Russia's Ryazan oil refinery has suspended operations at one of its primary crude oil processing units following a drone attack on October 15, Reuters reported, citing two sources in the oil industry.
According to the agency's sources, several processing pipelines were damaged in the strike, forcing the refinery to shut down one of its main units.
Three other primary processing units remained operational and may partly offset the reduction in output.
The disruption therefore represents a partial shutdown of oil processing rather than a complete halt to operations at the refinery.
The Ryazan refinery is owned by Rosneft and is one of Russia's major oil processing facilities. Its designed capacity is approximately 17 million metric tons of crude oil per year.
The plant produces gasoline, diesel and other petroleum products, some of which are supplied to Moscow.
On October 15, Ryazan regional governor Pavel Malkov reported a fire at the refinery following a drone attack.
The facility had been targeted earlier in 2026. According to Reuters, the unit shut down after the latest strike had also suspended operations following a previous attack.
The new damage came to light amid disagreements between Washington and Kyiv over Ukrainian strikes on Russian energy infrastructure.
US President Donald Trump has criticized attacks on Russian oil refineries, linking them to rising global oil prices.
Ukrainian authorities say such operations are intended to reduce Russia's ability to finance the war.
Reuters obtained its information about the shutdown and the nature of the damage from industry sources. Rosneft did not respond to the agency's request for comment on the consequences of the attack.