That reintegration is shifting the regional power balance between Shia-led Iran and Sunni-led Saudi Arabia, who are backing different sides in civil conflicts in Syria and Yemen.

With the West now engaged in fighting Sunni extremists like the Islamic State, Iran is seen as less of a security threat, Khonsari says.

"I think that recognition has come in the aftermath of this nuclear agreement," he said, "coupled with the fact that when you look at the economy, and economic issues, you see that Iran is today, also, because of its population and resources, it is the world's, you might say, foreign investment market."

The most valuable of those resources — oil — is now up for grabs. The country announced this month that it is seeking $25 billion in investments from foreign companies in a large number of new contracts.

If sanctions are lifted early next year, the oil — and the money — will start flowing.

Vocabulary

centrifuge：离心机

uranium：[化学] 铀

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