Iran's Foreign Minister Javad Zarif has begun a diplomatic tour to seek assurances that signatories to a landmark nuclear deal will back it despite its abandonment by the US.
The United States plans to reintroduce sanctions against Iran, which pumps about 4 percent of the world's oil, after abandoning a deal reached in late 2015 that limited Tehran's nuclear ambitions in exchange for the removal of USA and European sanctions.
But European diplomats have sought to play down expectations of Tuesday's meeting, stressing the enormous challenge of finding a way around United States sanctions punishing foreign businesses trading with Iran, which have global reach.
And Germany said it will spend the next few months trying to persuade Washington to change its mind. India's foreign secretary said the country wouldn't go along with the U.S. China's response is not clear yet.
"We don't want the United States pullout from the Joint Comprehensive Plan of Action to become a prelude for a further spike in military tensions in the Middle East, although the danger of this is evident", Ryabkov said, adding, "This danger followed the U.S. decision and what happened then is growing, according to our assessments".
Under the deal signed in Vienna with six world powers - China, France, Russia, the United Kingdom, the US, Germany, and the European Union - Iran scaled back its uranium enrichment programme and promised not to pursue nuclear weapons in exchange for the lifting of economic sanctions.
In a tweet on Sunday, Trump wrote: "Remember how badly Iran was behaving with the Iran Deal in place". But it's costing those refiners more to buy the crude oil they need to make those new gallons. "Now, that will not happen!"
On May 8, the US President Donald Trump put an end to Washington's commitments under the nuclear deal walking away from the Joint Comprehensive Plan of Action (JCPOA), reached in 2015 between Tehran and the six world powers.
Altmaier said there was a deadline of up to 90 days for foreign firms to comply with US sanctions or face penalties.
In the CNN interview, Bolton did not respond directly when asked whether Trump might seek "regime change" in Iran, or whether the U.S. military would be ordered to make a pre-emptive strike against any Iranian nuclear facility. He's talked about it with Prime Minister May, not just Iran's nuclear threat now, the threat in the future, the ballistic missile programs, and the instability that Iran is causing around the region, Bolton said. "The policy of the administration is to make sure that Iran never gets close to deliverable nuclear weapons".
Major companies, particularly in Europe, could see billions of dollars in commercial deals cancelled because of the USA decision to reinstall sanctions on Iran, though the ultimate impact remains unclear due to the possibility of renegotiations and exemptions, experts say.
"Certain U.S. allies, including Japan and South Korea, may comply with the proposed U.S.re-imposition of Iranian sanctions on the concern of losing the U.S. security umbrella vis-a-vis North Korea", said Khoman.
"We are not scared of sanctions", Ryabkov said.
Strong global oil demand growth, quickly falling inventories, and geopolitical issues from Iran to Venezuela could push oil prices to as high as $100 a barrel in 2019, Bank of America Merrill Lynch says.