Any attack on a nuclear plant is "suicidal", United Nations Secretary-General Antonio Guterres has warned, after fresh shelling hit a huge atomic power complex in southern Ukraine.
Moscow and Kyiv blame each other for the latest strike at the Zaporizhzhia plant, Europe's largest nuclear power site, which has been under Russian control since the early days of the war.
The fighting on Friday at the plant has prompted the UN's nuclear watchdog, the International Atomic Energy Agency (IAEA), to warn of "the very real risk of a nuclear disaster".
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At a press conference in Tokyo this morning, Mr Guterres condemned such attacks without saying either side was responsible.
"We support the IAEA on their efforts in relation to create the conditions of stabilisation of that plant," he said.
"Any attack to a nuclear plant is a suicidal thing. I hope that those attacks will end, and at the same time I hope that the IAEA will be able to access the plant."
His comments followed a visit to Hiroshima over the weekend, where Mr Guterres gave a speech to mark the 77th anniversary of the world's first nuclear bomb attack.
In the Japanese city on Saturday, he warned that "humanity is playing with a loaded gun" as crises with the potential for nuclear disaster proliferate worldwide, from Ukraine to the Middle East and the Korean peninsula.
He also delivered a stark warning against the horrors of atomic weapons a week ago in New York at a key nuclear Non-Proliferation Treaty conference, which he reiterated today.
"We are witnessing a radicalisation in the geopolitical situation that makes the risk of a nuclear war again something we cannot completely forget," he said.
When asked about China's massive military exercises around Taiwan, sparked by a visit last week to the self-ruled island by US House Speaker Nancy Pelosi, Mr Guterres said the UN "abides by a resolution of the General Assembly, the so-called One China policy".
"But we all want that resolution to correspond to a peaceful environment," he said, calling for common sense and restraint to allow for an "extremely important" de-escalation.
His comments come as two more grain-carrying ships have this morning sailed from Ukraine's Black Sea ports, Turkey's defence ministry said.
The Sacura, which departed from Yuzni, is carrying 11,000 tonnes of soybeans to Italy, it said, while the Arizona, which left Chernomorsk, is carrying 48,458 tonnes of corn to Iskenderun in southern Turkey.
Ukrainian President Volodymyr Zelensky yesterday called for a stronger international response to what he described as Russian "nuclear terror".
During a phone call with European Council President Charles Michel, he called for sanctions to be imposed on the Russian nuclear industry and nuclear fuel, the Ukrainian leader wrote on Twitter.
Meanwhile, 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.
Amnesty secretary general Agnes Callamard expressed regret at her departure and paid tribute to her work, but the organisation stands by its report.