Ukrainian drones on Monday struck energy facilities in southern Russia, triggering fires at a major oil refinery and gas processing plant and disrupting flights from the Volga to the Caucasus Mountains.

Russia's aviation watchdog Rosaviatsia said that it was suspending flights from the airports of Astrakhan as well as from four others, in Kazan, Nizhnekamsk, Saratov and Ulyanovsk to ensure air safety