Ukraine claims to have hit more than 40 Russian bomber planes at a number of military airbases, in one of its most audacious drone attacks since the war began. Footage appears to show Russian warplanes on a runway being struck and bursting into flames.

Ukraine attacked Russian nuclear-capable long-range bombers at a military base in Siberia on Sunday, the first such attack so far from the front lines more than 4,300 km (2,670 miles) away, according to pro-Russian bloggers.