Ukraine said a Russian drone crashed into the containment structure, starting a fire, but so far radiation levels have stayed constant.

The strike set fire to the shelter that contains radiation from the site of the largest nuclear disaster in history, according to Ukrainian officials.

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.