Ukrainian President Volodymyr Zelenskiy says the situation at the Russian-occupied Zaporizhzhia nuclear power station had become critical, with Russian shelling preventing restoration of a power line needed to cool the reactors and prevent a meltdown.

The head of the International Atomic Energy Agency, the UN nuclear watchdog, said it was working with both sides to restore the external power line. Rafael Grossi said there was no immediate danger as long as diesel generators remained in operation, providing emergency power for the facility.

Zelenskiy, speaking in his nightly video address on Tuesday, said one of the diesel generators providing emergency power was no longer working, seven days after external power lines went down.

"This is the seventh day. There has never before been such

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