Differences over the scope for the talks have also cast doubts on whether it will still go ahead, keeping open the risk of U.S. military action.

Ayatollah Ali Khamenei, Iran’s supreme leader, has vowed to unleash a regional war if America launches air strikes. Initially few in the Middle East seemed eager for further conflict. The region’s power-brokers tried to dissuade America from military action. But attitudes now look more mixed.

The U.S. Virtual Embassy Iran has repeated a warning to Americans to leave the country now in new advice

American citizens in Iran have been told to leave the country amid President Donald Trump’s recent threats of military action.

Mr Trump has deployed a “beautiful armada” to the Middle East after the Iranian regime ignored his warnings not to massacre protesters last month. Mr Khamenei, in turn, has warned him not to use it. “America should know that if it starts a war,

The presence of U.S. Navy Adm. Brad Cooper, in his dress uniform at the talks in Muscat, the Omani capital, served as a reminder that the aircraft carrier USS Abraham Lincoln and other warships were now off the coast of Iran in the Arabian Sea.

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