Renewed Ukrainian drone strikes against Russian oil refineries since late October have affected facilities that account for about 30 percent of Russia's total refining capacity, according to Reuters, citing two industry sources.
Over the past week, attacks have disrupted operations at nine of Russia's 35 largest refineries, including three large facilities in central Russia.
Industry sources estimate that actual crude processing losses could reach 200,000 tons per day, compared to about 700,000 tons, or 5 million barrels, being processed daily at the end of October.