Satellite images that have shown some recent activity around two Iranian nuclear sites bombed last year by Israel and the U.S. suggest Iran may be trying to recover materials from the area.

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.

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.

Tehran stuck to its position, but signaled a willingness to keep working toward a diplomatic solution.

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.

Iran is an OPEC member and produces more than 3 million barrels per day.

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.

Repairs at key missile sites began soon after they were hit by Israeli and U.S. strikes last year, but work at Iran’s nuclear facilities has been slower.

"Riyadh is firmly opposed to any US or Israeli military action against Iran at this stage," a former Saudi adviser told Newsweek.