Ukrainian drones attacked Russia's third largest oil refinery on Tuesday about 1,300 km (800 miles) from the front lines, hitting a core unit which processes about 155,000 barrels of crude refining per day. -snip- Pictures from the scene indicated the drone hit the primary refining unit, CDU-7, at the Taneco refinery. The unit accounts for around a half of the plant's total annual production capacity. "A drone attack was carried out on one of the enterprises in Nizhnekamsk," Ramil Mullin, the mayor of Nizhnekamsk, said. -snip- The attack was one of several in Tatarstan, a highly industrialised region south-east of...