New satellite imagery appears to show the aftermath of a long-range Ukrainian strike on an ammunition depot inside Russia on Saturday, as Kyiv continues its persistent cross-border attacks on Moscow's key military sites.

Footage shot from the road shows a huge explosion at an arms depot near Tikhoretsk in Russia. Ukraine said munitions from North Korea had been among those it was targeting. The governor of the Krasnodar region confirmed it came under Ukrainian drone attack on Friday night.

Russian reports say Ukrainian drones have struck a Russian arms depot deep inside the country, triggering explosions and the closure of a major highway.