The latest drone attack on an oil refinery in the Republic of Tatarstan signals a breakthrough in Ukraine’s strategy of striking deep inside Russian territory, according to findings from the Institute for the Study of War (ISW). The report says that on April 2, Ukrainian drones targeted facilities at the Taneko oil refinery in the city of Yelabuga, Republic of Tatarstan. ISW highlighted that this facility is located over 1200 kilometers from the Ukrainian border with Russia. According to Reuters, such regular drone strikes by Ukraine on Russian oil refineries have led to the shutdown of about …