A drone strike has caused a massive fire at an oil depot in Russian-controlled Crimea, local officials say. Social-media footage showed flames billowing from the site in Sevastopol, Crimea's main city, early on Saturday. The fire was later put out and no-one was hurt, the Moscow-appointed regional governor said. On Friday Russia launched a wave of air strikes in cities across Ukraine, killing at least 25 people. It was the first such attack in months. The Crimean peninsula, which was annexed by Russia in 2014, is home to the main naval base for Moscow's Black Sea Fleet. "According to preliminary...