Ukraine's military said it carried out a drone strike against a major oil refinery deep inside Russian territory in the early hours of Tuesday, continuing its sustained campaign against Russian energy production and export infrastructure.

The Ukrainian military reported that it had struck the Orsknefteorgsintez oil refinery, located in the city of Orsk in Russia's Orenburg region. Orsk sits approximately 1,500 kilometers (930 miles) from the frontline, making it one of the deepest strikes into Russian territory conducted by Ukrainian forces.

"Fire was recorded. Damages are being ascertained," the Ukrainian military said on its Telegram channel.

Ukraine's General Staff described Orsknefteorgsintez as one of the largest refineries in the Orenburg region and a significant asset in Russia's fuel and energy sector. The facility has an annual processing capacity of approximately 6 million tons of crude oil, producing gasoline, diesel, aviation fuel, fuel oil, bitumen, and other petroleum products. The Orenburg region is a major hydrocarbon-producing area in the southern Urals, and refining infrastructure there supports both domestic distribution and Russia's broader export economy.

"The Ukrainian Defense Forces will continue to systematically implement measures aimed at stopping the armed aggression of the Russian Federation," the General Staff said in its statement.

The strike on the Orsk refinery is the most recent in a series of drone attacks targeting Russian refining facilities over the past several weeks, as Ukraine seeks to constrain fuel supplies both within Russia and along the frontlines. Analysts have noted that refinery disruptions can affect military logistics, as diesel and aviation fuel are critical for sustaining mechanized units and air operations.

Earlier in the week, a Ukrainian drone attack on a city in Russia's Tatarstan region killed 12 people and wounded at least 39 others in a large-scale strike that also struck one of Russia's most technologically advanced refineries. Tatneft's Taneco refinery was hit in the attack, according to multiple unverified reports and videos circulating on social media.

Ukraine has conducted a persistent drone campaign throughout the year targeting Russian oil refining infrastructure and supply routes, part of a broader strategy to pressure Moscow toward negotiating peace. The campaign has highlighted the evolution of Ukraine's long-range unmanned aerial vehicle capabilities, which have repeatedly penetrated Russian air defenses across multiple regions.

The renewed wave of refinery strikes followed a several-week lull during which Ukrainian forces had concentrated attacks on Russia-linked tankers in the Sea of Azov and the Black Sea.

Russia has been experiencing gasoline and diesel shortages for more than three months amid peak demand season, as Ukraine's drone campaign forced numerous major processing facilities offline during the spring and summer. Russian authorities have periodically implemented export bans on gasoline and diesel to stabilize domestic supply.

By Charles Kennedy for Oilprice.com