By bne IntelliNews Ukraine launched a second day of heavy drone attacks on Russian oil refineries on March 13, resulting in fires at key facilities. Ukraine has repeatedly used unmanned aerial vehicles (UAVs) to target Russian refineries in a series of attacks that started in January. The relentless attacks on Russian refineries have led to widespread disruptions in the nation’s energy supply chain, exacerbating concerns over fuel shortages and export constraints. The most significant attack on March 13 targeted Rosneft’s largest refinery in the Ryazan region, regional governor Pavel Malkov co…