Proposal will be at heart of offer to US as Trump considers whether to attack Iran

Iran is refusing to export its 300kg stockpile of highly enriched uranium, but is willing to dilute the purity of the stockpile it holds under the supervision of UN nuclear inspectorate the IAEA, Iranian sources have said.

The proposal will be at the heart of the offer Iran is due to make to the US in the next few days, as the US president, Donald Trump, weighs whether to use his vast naval build-up in the Middle East to attack the country.