By Ben Aris in Berlin Russian oil refineries are not normally newsmakers, but they have found themselves on the front page recently as Ukraine’s new long-range drones have brought some of Russia’s oil infrastructure within striking distance, Sergey Vakulenko, an independent energy analyst and consultant to a number of Russian and international global oil and gas companies, said in anote for Carnegie Endowment for International Peace. Several Russian refineries have been hit by drones or been the subject of suspected arson attacks in the last weeks, suggesting that Ukraine has changed tactics a…