Ukrainian drones attacked the only large oil refinery on Russia's Black Sea coast on Friday morning, authorities said. The attack on the Rosneft-owned refinery in the southern Russian town of Tuapse was reported by local authorities, who said a fire had broken out at the facility and that emergency services were working to extinguish the blaze. -snip- The Russian Black Sea naval port of Novorossiysk and Crimea's Sevastopol were also targeted a the massive aerial assault, which Russia's defense ministry said involved at least 100 drones.