The Fars news agency said Washington had presented a five-point list which included a demand for Iran to keep only one nuclear site in operation and transfer its stockpile of highly enriched uranium to the United States.

Washington also refused to release “even 25 per cent” of Iran’s frozen assets abroad or pay any reparations for the damage inflicted on Iran during the war, according to Fars.

The Mehr news agency, meanwhile, said: “The United States, offering no tangible concessions, wants to obtain concessions that it failed to obtain during the war, which will lead to an impasse in the negotiations.”

Sunday saw more unrest in parts of the region. A drone strike triggered a fire near a nuclear power station in the emirate of Abu Dhabi, authorities said, reporting no injuries or impact on radiation levels.

Iranian-backed armed groups equipped with drones are based in Iraq, while Tehran’s allies in Yemen — the Houthi rebels — also possess combat-grade UAVs.