Russia has been accused of 'nuclear blackmail' as an expert warns a drone attack at Chernobyl power station will lead to rising radiation levels

Firefighters worked across the weekend to tackle smouldering roof insulation in the giant protective shelter which covers Chernobyl's unit 4 following the drone strike on Friday. Radiation levels in the area remain normal - the original protective shelter inside the giant structure did not suffer any damage.

A Russian drone has hit the protective shelter over Chernobyl's damaged nuclear reactor, Ukrainian President Volodymyr Zelensky has said. The overnight strike at the site of the world's worst nuclear accident caused a fire that has since been extinguished, he added.