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A third Russian airfield was set ablaze by a drone strike a day after Ukraine demonstrated an apparent new ability to penetrate hundreds of kilometres into Russia with attacks on two air bases.

Officials in the Russian city of Kursk, about 90 km (60 miles) north of the Ukraine border, released pictures of black smoke above an airfield after the latest strikeon Tuesday. The governor said an oil storage tank had gone up in flames but there were no casualties.

On Monday, Russia said it had been hit hundreds of kilometres from Ukraine by what it said were Soviet-era drones - at Engels air base, home to Russia's strategic bomber fleet, and in Ryazan, a few hours' drive from Moscow.