Ukrainian engineers and construction workers are carrying out temporary repairs on the building containing the remains of the reactor destroyed in the 1986 Chernobyl accident after it was severely damaged in a drone attack earlier this year, International Atomic Energy Agency (IAEA) director-general Rafael Grossi said.

The drone strike on 14 February pierced a large hole through the roof of the €1.5bn ($1.7bn) structure – known as the New Safe Confinement (NSC) – which was built to prevent any radioactive release from the Unit 4 reactor and protect it from external hazards.