Ukraine's recent attacks knocked out the Russian refinery by 30%.
According to Reuters sources and officials, over the past week, Ukrainian attacks have disrupted operations and caused accidents at 9 of Russia's 35 largest refineries.
The total nominal capacity of the Russian refineries that have been attacked since the end of October, in particular the three largest plants that were hit in central Russia, is about 300 thousand tons, or 2.2 million barrels per day.