At the heart of the deal to end the Middle East war lies a $300 billion fund to rebuild and develop Iran – but so far it is unclear who will foot the bill.

The memorandum of understanding (MoU) says Washington “undertakes with regional partners to develop a definitive mutually agreed plan with at least $300 billion for the reconstruction and economic development” of Iran.

“The mechanism for the implementation of this plan will be finalised as part of a final deal within 60 days,” it added.

The text does not say who will contribute to the fund.

Gulf countries, divided over Iran in the aftermath of the war, have not confirmed they would invest in the scheme to rebuild their powerful neighbour.

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