Firefighters on Tuesday continued to battle a large blaze at an oil storage site in southern Russia’s Rostov region, officials said, two days after a Ukrainian drone strike on the facility. The fire broke out early Sunday after Russian air defense systems shot down Ukrainian drones in the town of Proletarsk. Ukraine’s military said that its drones targeted the Kavkaz oil and petroleum storage facility. A video published by local media on Tuesdayshowed thick black smoke blanketing the sky over Proletarsk. The fire has so far engulfed a total area of 10,000 square meters (107,640 square feet), P…