Ukrainian drone forces struck the Tuapse oil refinery for the fourth time in two weeks on May 1, reigniting fires that Russian emergency services had claimed extinguished less than 24 hours earlier. Russia’s average refinery capacity has dropped to its lowest level since 2009. The Tuapse facility — a Rosneft-operated complex with an annual crude processing capacity of approximately 12 million tonnes and direct connection to a Black Sea marine terminal — has been effectively taken off line by a campaign that did not require a single manned aircraft to penetrate Russian air defenses.