Salehi said on state television that Iran has imported some 400 tons of so-called yellowcake uranium since the 2015 landmark nuclear deal, bringing its stockpile to between 900 and 950 tons - up from 500 tons.
Deterred by USA punishment threats, Some of the worldwide companies, which also signed major deals with Iran in energy, transport and auto industries following the 2015 nuclear deal, have announced their withdrawal from Iran.
A delegation from the U.S. State Department and U.S. Treasury are expected for talks in Delhi this week to discuss Iran sanctions, according to Indian officials.
Iranian oil exports - they are the world's sixth largest - have been of particular importance to global market stability.
"That might include pressure to release oil from the Strategic Petroleum Reserve, which the administration indicated they were considering on Friday", said Lipow.
"America is a country that has good technology, if it had good leaders too, it would be able to work very well with Iran and other countries, in a way that both parties could benefit", said Behrouz Kamalvandi, spokesman for Iran's Atomic Energy Agency.
Mnuchin said he would meet with counterparts from developed and developing countries on the sidelines of a G20 finance ministers' meeting in Buenos Aires on July 19-22. But French oil group Total and carmaker PSA have already indicated they are likely to pull out of Iran.
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The U.S. has faced significant pushback from key European allies over the planned imposition of so-called "secondary" sanctions that target businesses that continue to buy Iranian oil.
EU's Big Three agree to establish dollarless trade with Iran - Lavrov Major European countries party to nuclear negotiations with Iran - France, Germany and the United Kingdom - have agreed to maintain trade with Tehran independent from the USA dollar, said Russia's Foreign Minister Sergey Lavrov.
In a letter to European Union officials, Secretary of State Mike Pompeo and Treasury Secretary Steven Mnuchin said the U.S. government wants to maximize pressure against Iran as sanctions begin to be imposed next month. He did not name the country he had not yet consulted.
It said exemptions would only be made if they benefited United States national security. "I'm very confident they understand".
Iranian Foreign Minister Mohammad Javad Zarif on Monday wrote a tweet post on the issue.
"On 3rd anniversary of JCPOA, it remains a triumph of multilateral diplomacy despite U.S. actions", Zarif tweeted. "Our country is committed with the rule of law in response to the United States" disregard for diplomacy and legal obligations, the note underlines.