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The United States and Iran have reached an agreement to extend a ceasefire, allow shipping through the Strait of Hormuz and lift a US blockade and some sanctions on Iran, sources have said, but the deal has not been finalised. US President Donald Trump’s approval is still pending.

An agreement would represent a big step towards ending a war that has pushed the world towards an energy crisis, though the underlying dispute over Iran’s nuclear programme would only be thrashed out in talks over subsequent weeks.

Following a ceasefire in early April, the two sides have remained at odds on issues including Iran’s nuclear ambitions, Israel’s war in Lebanon with Hezbollah, and Tehran’s demands for the lifting of sanctions and the release of frozen assets.

After weeks of mainly indirect talks, four sources familiar with the matter told Reuters on Thursday that the US and Iran had agreed to a memorandum of understanding that would halt the war and give negotiators 60 days to reach a final deal.