The order did not specify the rate that could be imposed, but used 25% as an example.

After a round of indirect talks with Trump's envoys in Oman, Iran's top diplomat says the country will keep negotiating, but stresses a lack of trust.

Iran is skilled at prolonging negotiations over its nuclear program, and seems to be hoping President Trump is out for a quick win, rather than a prolonged regional war.

US President Donald Trump warned that Iran’s supreme leader should be “very worried,” as both sides prepare for their first formal negotiations since the United States bombed Tehran’s nuclear program last year.

Low oil prices give President Donald Trump more leverage over Iran, U.S. Energy Secretary Chris Wright said Friday, speaking as the two adversaries teeter on the brink of another conflict.

The BBC World Service has launched a temporary emergency lifeline radio programme for Iran in response to the ongoing turmoil in the country, and the unprecedented crackdown on protests.

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.

Iran requested to move talks from Turkey, Secretary of State Rubio confirms. Rubio laid out what topics needed to be discussed for a "meaningful" result.

"It would not be possible to attack American soil, but we will target their bases in the region,” said Foreign Minister Abbas Araqchi.