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Trump, who pulled the US out a 2015 nuclear deal between Iran and world powers during his first term, warned that Iran would be in "great danger" if talks were not successful.

Aid agencies are now calling for world powers to force Israel to allow essential goods into Gaza - including food, medicines, hygiene products and fuel - pointing to the country's obligations under international humanitarian law.

With Hamas weakened, world powers are deciding the future of Gaza.

Trump's desire mounts another threat to the territory's security as other world powers, including Russia and China, seek influence in the Arctic.

Almost a decade since world powers sealed a historic deal to limit the Iranian nuclear programme, this is a crunch moment for Iran and the international community.