Overnight missile and bomb strikes by Russia on the Ukrainian city of Kharkiv left three people dead and 22 hurt, while a Ukrainian drone attack in the Moscow region wounded two people, officials from both countries said separately on Saturday.

A huge blaze has erupted at an oil refinery in a Russian town that was hit by Ukrainian drones earlier this year. Footage shows a fire raging at the industrial site in Kstovo, around 500 miles from the front lines in eastern Ukraine.