The Ukrainian Armed Forces' General Staff reported the information."As part of reducing the enemy's offensive potential and disrupting the supply of fuel and ammunition to occupying forces' military units, units of Ukraine's Defense Forces struck the facilities of the Slavneft-YANOS oil refinery in the Yaroslavl region of the Russian Federation," the statement reads.Slavneft-YANOS is one of Russia's largest refineries: it is involved in supplying the Russian army and is capable of processing up to 15 million tons of oil and oil condensate annually.At the same time, the Ukrainian Armed Forces struck an ammunition depot and enemy personnel concentration points near the village of Avdiivske (formerly Pervomaiske) in the areas of Myrnohrad and Rodynske in the Donetsk region.Russian losses are currently being clarified.On the night of December 5, Ukrainian forces attacked the infrastructure of the Temryuk seaport in the Krasnodar Krai and the Syzran oil refinery in the Samara region of Russia.