IAEA Director General Rafael Grossi said on Monday that the situation at Ukrainian nuclear power plants remains "extremely challenging."

He said this during a meeting of the agency's Board of Governors in Vienna, according to Ukrinform citing Sky News.

Grossi highlighted a number of dangerous incidents that have occurred recently, including a strike by a Russian drone on a spent nuclear fuel storage facility located a few kilometers from Chornobyl.

The IAEA chief said that part of the fuel reception building suffered "significant structural damage," while spent fuel is "stored in casks just a few hundred metres" away.

"Attacking a facility with large amounts of nuclear material is extremely dangerous. It must not happen," Grossi said.