Russia’s largest oil refinery, the Omsk plant in western Siberia, halted fuel production and exchange sales on 7 July after a Ukrainian drone strike the previous day damaged two primary processing units, according to industry sources and exchange data. The attack forced the shutdown of the CDU-10 unit, responsible for 38 per cent of the refinery’s capacity, and the CDU-11 unit, which accounts for a further 37 per cent, after network connections were severed. The refinery, owned by Gazprom Neft, stopped offering gasoline and diesel on the St. Petersburg International Mercantile Exchange, while the Omsk-based Topline chain of 53 filling stations suspended fuel sales to private customers, serving only corporate clients with fuel cards.

Ukrainian military officials confirmed the strike, stating that the Omsk refinery was the last of 11 major Russian fuel producers to be targeted in a campaign against energy infrastructure. Russian regional authorities acknowledged the damage, with the governor of Omsk region reporting no casualties and the Kremlin’s envoy to Siberia, Anatoly Seryshev, saying that restoration work was under way. Gazprom Neft did not respond to requests for comment. In the neighbouring Kemerovo region, Governor Ilya Seredyuk ordered an audit of bomb shelters and the preparation of public information, citing the need to apply lessons from the Omsk attack, which he described as a warning for his own territory.

The disruption at Omsk, which processed 22 million tonnes of crude oil last year and supplied fuel primarily to European Russia, is expected to deepen fuel shortages across the country, according to analysts in the region. The refinery had become a key supplier after earlier Ukrainian strikes knocked out or damaged facilities in the country’s west. Local civil society figures warned that the loss of up to two-thirds of primary processing capacity would cascade through supply chains, with queues already forming at petrol stations. Two mothballed units with a combined capacity of 20,000 tonnes per day could theoretically be restarted, but industry sources cautioned that the timeline for any resumption of full operations remains unclear.

The attack, which occurred in daylight and triggered delayed public alerts in Omsk, extends the demonstrated range of Ukrainian long-range drones to 2,500 kilometres from the border, placing virtually all major Russian refining assets within potential reach. Russian authorities have not officially declared a production halt, but the presidential envoy’s statement and the exchange data confirm the operational impact. Restoration efforts are ongoing, and the refinery’s ability to bring the newer CDU-11 unit back online in the coming days will be a key indicator of how quickly fuel flows can be partially restored.