The step was seen as a significant step taken by Iran's nuclear programme in response to the UN nuclear watchdog resolution calling for Tehran to cooperate in its probe.
The International Atomic Energy Agency says the situation at Europe's largest nuclear power plant is unjustifiable, urges the immediate establishment of a security protection zone.
A group of experts will be at the Zaporizhzhia nuclear plant in southern Ukraine until Sunday or Monday, International Atomic Energy Agency chief Rafael Grossi says.
UN inspectors visit a Russian-occupied power plant to "prevent a nuclear accident" there as the Kremlin criticises a EU move making it difficult for Russians to enter the bloc on the 190th day of the conflict.
The 14-strong team arrives in Zaporizhzhia from Kiev with a convoy including white UN-marked cars, as Kiev and Moscow trade blame over shelling at and around Europe's largest nuclear power plant.
The UN nuclear watchdog will assess any damage from recent shelling near the Zaporizhzhia nuclear power plant, which Russia and Ukraine have blamed on each other.
Concerns over Zaporizhzhia continue to grow, with Ukraine accusing Russia of firing on areas just across the river and Russia claiming that Ukrainian shelling hit a building where nuclear fuel was stored.
Türkiye's presidential spokesman Ibrahim Kalin says Ankara is working "very hard" to bring Russia and Ukraine closer, adding that "the trust that we were able to build" through the grain deal could restart talks.
Iranian Foreign Minister Hossein Amir-Abdollahian says he believes the Qatar talks have been "positive" and a deal could still be reached.
Tehran's reaction came as countries at an International Atomic Energy Agency meeting in Vienna voted to censure Iran for failing to cooperate over its nuclear programme.
UN nuclear watchdog condemns Iran for refusing to provide answers about uranium traces at three undeclared sites, and Tehran accuses IAEA of being "ungrateful for Iran's extensive cooperation."
Israeli Prime Minister Naftali Bennett has accused Iran of deceiving the international community about its atomic activities and said his country “reserves the right to self-defence“.
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