"The air defence forces of the defence ministry repelled a massive attack by aircraft-type drones on the territory of the Volgograd region," Governor Andrei Bocharov said in a statement issued by the administration of the southern Russian region on the Telegram messaging app.

Ukraine's overnight drone attack targeted fuel and energy facilities in Russia, sparking a fire in the Astrakhan region and forcing the suspension of flights at several airports, Russian officials and media said on Monday.

At least four people have died overnight as Russian drone and missile strikes continued to pound Ukraine’s towns and cities and Moscow’s troops continue their grinding advance through the country’s ea