Satellite photos analyzed by The Associated Press on Wednesday show seven destroyed bombers on the tarmac at a Russian air base in eastern Siberia, one of the targets Ukraine said it struck with drones in one of the most daring covert operations of the war.

On 1 June, more than 100 Ukrainian drones struck strategic targets deep into Russia in an elaborate and audacious operation.

On the eve of peace talks, Ukraine and Russia sharply stepped up the ongoing war with one of the biggest drone battles of the conflict and an ambitious attack carried out on nuclear-capable bombers deep in Siberia.