Primary oil processing at Rosneft’s Novokuibyshevsk refinery has been halted. The outage, which began on April 18 after a Ukrainian drone strike, encompasses the first stage of crude processing at one of Russia’s refineries in the Samara region, two sources told Reuters on Tuesday. The outage follows attacks reported on Saturday by Samara region governor Vyacheslav Fedorishchev, who said the Novokuibyshevsk and Syzran refineries had been targeted. The Novokuibyshevsk plant is operated by Rosneft and processed 5.74 million metric tons…