KYIV (Reuters) -Ukrainian drones attacked a Rosneft-owned oil refinery in southern Russia in the latest such strike on Russian energy infrastructure, a Ukrainian source said on Thursday. Local officials in Russia said there was a fire overnight at the export-oriented unit in the town of Tuapse, but it was extinguished. “The vacuum unit was on fire. According to preliminary information, there were neither casualties nor injured,” Sergei Boiko, the head of Tuapse district, said on Telegram. Rosneft, Russia’s largest oil producer, has not commented. The Ukrainian source said the SBU security serv…