A key Russian oil refinery in the city of Saratov halted processing on July 8 following a Ukrainian drone strike on the facility, Reuters reported on July 9, citing undisclosed sources.

Russia's largest oil refinery in the Omsk region of western Siberia has halted operations following a Ukrainian drone attack, two industry sources said on Tuesday.

The Omsk oil refinery has suspended operations following a drone attack by the Ukrainian Armed Forces. Fuel shortages are expected across Russia.