Radio Liberty reported the information, citing a source within the security service.According to the source, the drones were deployed by the SBU's Special Operations Center “A”, striking a site 1,400 kilometers from Ukraine. Ufa, described as “one of the largest” oil refining centers in Russia, supplies fuel and lubricants to the Russian armed forces.“After the strike, firefighting units arrived at the refinery, and a column of black smoke was seen over the site. Preliminary reports indicate a fire broke out in the ELOU-AVT-6 crude oil processing unit,” the source explained.The strike reportedly affected the Kirishinefteorgsintez refinery, which has previously been targeted by Ukrainian operations.“This is the third deep strike by the SBU in Bashkortostan in the last month — 1,400 kilometers from Ukraine. Such operations demonstrate that there are no safe places in the deep rear of the Russian Federation. The SBU can reach any targets on enemy territory that are working against Ukraine,” the source said.Since early 2024, Ukrainian drones have regularly hit Russian oil refineries and military targets, and most of these attacks have been confirmed by Ukraine’s General Staff. In official statements, Kyiv emphasizes that these operations are part of systematic measures “aimed at reducing the combat potential of the Russian occupation forces, as well as forcing Russia to stop its armed aggression against Ukraine.”