Ukraine's President Volodymyr Zelensky speaks in Kyiv. File photo
Energoatom, operator of the Zaporizhzhia nuclear power plant in the south of the country, said on Saturday that parts of the facility had been "seriously damaged" by military strikes and one of its reactors was forced to shut down.
Friday's strikes had damaged a station containing nitrogen and oxygen and an auxiliary building, Energoatom said on the Telegram messaging service.
As hostilities raged on in the east and south of Ukraine, pro-Moscow authorities in the Russian-occupied Kherson region reported the assassination of a senior official.
Zaporizhzhia nuclear power plant had been "seriously damaged" by military strikes.
And the head of Amnesty International's Ukraine office announced she had resigned from the organisation over the group's publication of a controversial report that accused the country's military of endangering civilians.
Kyiv and Moscow have blamed each other for the attacks on the Zaporizhzhia plant, Europe's largest atomic power complex.
Zelensky, in his nightly address on Saturday, once again accused Moscow of terrorism, saying, "Russian terrorists became the first in the world to use the power plant... for terror."
The head of the UN's nuclear watchdog expressed alarm over the shelling at the plant. The strikes underline "the very real risk of a nuclear disaster", said Rafael Grossi, director general of the International Atomic Energy Agency (IAEA).
"Any military firepower directed at or from the facility would amount to playing with fire, with potentially catastrophic consequences," he added.
The European Union's top diplomat Josep Borrell condemned the attack "as a serious and irresponsible breach of nuclear safety rules and another example of Russia's disregard for international norms".
The eastern Donetsk region has faced the brunt of Russia's offensive since its assault on Kyiv failed weeks into the invasion launched on February 24.
Incessant shelling has left Ukrainian forces defending ruins in Sievierodonetsk, but their refusal to withdraw is stalling a massive Russian offensive across the Donbas.
Zelensky expressed confidence in Ukraine's ability to reclaim territory, calling on the nation's allies to send more weapons. "We just need enough weapons to ensure all of this. Our partners have them."
The visit stems from the brotherly relations between the two countries and their two brotherly peoples.
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