Despite more than a year of warnings that critical Ukrainian nuclear energy infrastructure sites are vulnerable to potential Russian attacks, Ukraine's Energy Ministry has failed to act swiftly to protect them,

International Atomic Energy Agency (IAEA) chief Rafael Grossi arrived in Kyiv on Tuesday and inspected an electricity distribution substation, warning that attacks on Ukraine's power grid could pose a risk of a nuclear accident by disrupting supply.

International Atomic Energy Agency (IAEA) chief Rafael Grossi said late on Monday that he was on his way to visit Kyiv and inspect a key substation that is critical for the safety of Ukraine's nuclear power.