But that has proved hard: European companies have quit Iran, arguing that they can not risk their USA business.
Iran's markets were actually relatively buoyant, with the rial strengthening by 20 per cent since Sunday after the government relaxed foreign exchange rules and allowed unlimited, tax-free gold and currency imports.
On Tuesday, the U.S. reinstated sanctions targeting the Iranian government's purchase of U.S. dollars, Iran's trade in gold and other precious metals, and its automotive sector.
State energy firms CNPC and Sinopec have invested billions of dollars in key Iranian oil fields such as Yadavaran and North Azadegan and have been sending oil to China.
Turkey, however, said it would continue to buy natural gas from Iran.
In several videos posted to social media over the past week, crowds of dissidents are heard chanting, "Death to the dictator" as the United States prepared to reinstate sanctions on the country following President Donald Trump's exit from the worldwide nuclear deal in May.
Rouhani said Iran and North Korea have had common views during many "sensitive worldwide periods" and said Iran will work to improve ties and global cooperation with North Korea. Donald Trump claimed they were "the most biting ever imposed" and warned that in November, sanctions would "ratchet up to yet another level" with an embargo on Iranian oil and blanket sanctions on Iranian banks.
In a speech hours before the sanctions were due to take effect on Tuesday, Rouhani rejected negotiations as long as Washington was no longer complying with the deal.
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This is especially true for a company like Tesla that has a long-term, forward-looking mission. Tesla shares, which were already rising on news of the Gulf investor, spiked in response.
Oman hosted secret talks between the two countries in 2012 that ultimately led to the 2015 landmark nuclear deal with world powers.
This comes as the Ayatollah regime is trying to rally global support for its regional policies.
German Foreign Minister Heiko Maas, however, warned that the unilateral U.S. sanctions could further destabilise the Middle East and boost "radical forces" in the region.
"We still think that it is a mistake to give up on the nuclear accord with Iran", Maas said in an interview with the daily Passauer Neue Presse. "Chaos in Iran -as we have experienced in Iraq or Libya- would destabilize an already troubled region even more".
"America has zigzagged constantly, so now no one trusts them", he said.
British Foreign Office Minister Alastair Burt said that the "Americans have really not got this right".