The operation was carried out by units of the Main Intelligence Directorate (GUR) and the Armed Forces of Ukraine, hitting the Ilsky oil refinery in southern Russia (Krasnodar Krai) and the Syzran oil refinery on the Volga River (Samara region) simultaneously .
In the same wave, Ukraine also struck a Russian military observation post on the Syvash drilling rig in the Black Sea .
At the Ilsky refinery, a fire broke out that local authorities later said was extinguished. Five people were reported wounded . The Ilsky refinery has six processing units with a combined capacity of about 6.6 million metric tons of oil per year .
At the Syzran refinery, drones caused a major fire at the facility, which had already been forced to halt operations after an earlier Ukrainian drone attack on July 12 damaged its primary refining unit . OSINT channels and local Telegram accounts reported large fires visible at both refineries, with Syzran residents describing the scene as reminiscent of "Metro 2033" .
Russian regional governors acknowledged the attacks. Krasnodar Governor Veniamin Kondratyev confirmed the fire at Ilsky and reported five wounded . Samara Governor Vyacheslav Fedorishchev reported that drones targeted an industrial facility in his region but did not identify the enterprise .
Russia's Defense Ministry claimed it shot down 397 Ukrainian drones over multiple regions overnight, but acknowledged that debris from downed drones caused the fires .
These strikes are part of a sustained Ukrainian campaign to degrade Russia's energy infrastructure that funds its war effort. Ukraine has repeatedly stated its objective is to deprive Russia of revenue and disrupt fuel supply to its military .
The Syzran refinery had already been hit on July 12 and again around August 4, illustrating a pattern of repeated, targeted strikes to keep key refineries offline . On August 4, Andrii Kovalenko, head of the Center for Countering Disinformation at Ukraine's National Security and Defense Council, said "the Syzran oil refinery is out of commission" .
This operation also echoed large-scale strikes in early August, including a Ukrainian drone attack on August 2 that hit three refineries in Bashkortostan nearly 1,600 km from Ukraine's border , showing Ukraine's growing ability to strike deep inside Russia with long-range drones.
By hitting both a southern refinery (Ilsky, supplying Russia's Black Sea region) and a Volga-region refinery (Syzran, supplying central Russia), the strikes aimed to maximize disruption across two separate fuel supply chains simultaneously .