ISTANBUL – Iranian Pres. Hassan Rouhani said he had instructed his diplomats to negotiate with European countries, Russia and China to intervene in nuclear trade despite the US withdrawal from the agreement.
But Rouhani said Iran is ready to begin unlimited uranium enrichment if these negotiations would not bring benefits in a few weeks.
Iranian officials struck a defiant tone on Tuesday when President Trump withdrew the United States from a groundbreaking nuclear deal, Tehran, a move that would reinstate harsh economic sanctions and cause Iran to cease nuclear activity.
Trump, a long-time critic of the 201
"The United States will withdraw from the nuclear deal with Iran," Trump said in a televised speech. He called it "a terrible, one-sided deal that should never have been made" and claimed that Iran has ambitions to build nuclear weapons.
Trump said he would again impose "mighty" nuclear fines on Iran. However, he gave no details of the sanctions that should be re-imposed.
The ruling could trigger renewed US sanctions on Iran's oil sales and central bank, potentially disrupting Iran's financial operations and further putting pressure on the already volatile economy. It could also force European allies to continue their economic negotiations with Iran since the agreement was implemented in early 2016. Allies stand firm behind the deal negotiated between Iran and six world powers States, Russia, China, Britain, France and Germany
The Allies could also face sanctions under new US sanctions and eliminate incentives for further investment in Iran ,
In his speech, Trump accused Iran of destabilizing the Middle East by supporting militant groups such as the Lebanese Hezbollah, and he accused Tehran of building "nuclear weapons-ready" ballistic missiles.
"If I allowed this deal, there would soon be a nuclear arms race in the Middle East," Trump claimed. "We can not prevent an Iranian nuclear bomb from the decaying and rotten structure of the current agreement," he added. "The Iran deal is flawed at its core."
Under the nuclear agreement, Iran has committed itself never to "seek, develop, or acquire nuclear weapons." Iran's top religious and political leader has declared that Islamic people say that their nuclear program should only produce energy and do medical research.
Iranian leaders said on Tuesday that the country would be united in the face of new sanctions or threats from the United States.
Iran "may have some problems" when Trump restores sanctions, Rohani said at a petroleum conference in the capital Tehran before Trump announced his decision. "But we will go on."
"If we are under sanctions or not, we should get up," the Reuters news agency quoted him.
Rohani's first vice president, Eshaq Jahangiri, said the government has "a plan to manage the country under all circumstances"
In reports the Iranian Tasnim News Agency said Jahangiri, a popular reformist, said it was "naïve" again To enter into negotiations with the United States.  The comments underscored a growing debate among political groups in Iran over what to do if, after the US withdrawal. Some politicians have called on the government to continue working with Europe to rescue the agreement, which removes important international sanctions in return for curtailing the Iranian nuclear program.
"If the Europeans are willing to give us sufficient guarantees, it makes sense to us to stick with the agreement," said Ali Motahari, Deputy Speaker of the Iranian Parliament, in the Iranian news agency's statements.
Motahari said that Iran should wait a few months to see if Europe wants to resist US pressure to disconnect from the Iranian economy, where European companies have invested in sectors such as automobile manufacturing, oil exploration and tourism.
If Europe succeeds, "this is a victory for Iran because it creates a gap between the US and Europe," he said.
But others forgave less and urged the Iranian leaders to immediately withdraw suspended elements of the country's nuclear program and restart if the United States has left the deal. Aviators on the Internet called for a rally in the northeastern city of Mashhad to "set the JCPOA on fire". The nuclear agreement is also referred to as the JCPOA (Joint Comprehensive Plan of Action).
The Iranian Parliament's Atomic Committee released three actions that the government could take if Trump leaves the business, including installing more centrifuges and enriching uranium beyond the levels allowed under the agreement. Enriched uranium can be used as fuel for nuclear power plants or, if enriched at a much higher level, as a fissile material for nuclear weapons.
When Trump confronts Iran, "we are not passive," said the head of the National Security Council, Ali Shamkhani said in an interview with the Hamshahri newspaper Tuesday.
He said Europe had made a mistake when its leaders calmed Trump by trying to make further concessions from Iran, including a possible halt to its missile program. The nuclear deal was the result of tedious negotiations between the Rohani government and the world powers, including the Obama administration over two years.
While Iran accepted strict limits on its nuclear program including inspections, critics said the deal had not dealt with other problematic aspects of Iranian politics, including rocket development and support for militant groups in Iraq and Syria
"The Islamic Republic will be determined against this threat, "said Shamkhani on the attitude of the Trump government.
Even as Iranian leadership To defy the storm, the Iranian economy was already feeling the burden. Governor Valiollah Seif of Iran has played down every possible shock on the Iranian markets, which has been shaken by high inflation and the collapsing currency.
"We are prepared for all scenarios," Seif said on state television. "If America goes out of business, our economy will not be affected."
But the Iranian riyal was trading at record lows against the dollar on Tuesday, as Iranians wanted to buy hard currency ahead of Trump's announcement, economists said.
According to Pratibha Thaker, an Iran expert at the Economist Intelligence Unit, a risk analysis group, Trump's withdrawal from the pact would accelerate regional insecurity, cause a decline in global oil supplies, and plunge the Iranian economy into recession.
"Fear, Stress …. [these are] People's feelings just hours before Mr. Trump's extraordinary decision," wrote an Iranian journalist, Amine Sherifkan, on Twitter.
A deterioration in the economic situation could be a problem for Rohani, a moderate cleric who fought for the nuclear deal, to start the Iranian economy and end the isolation of the country.
Rouhani put much of his political credibility in the nuclear deal with the world powers. But even as oil exports rose in the wake of the agreement, ordinary Iranians said they had felt few tangible benefits from the deal.
Widespread economic turmoil, currency fluctuations and a recent judicial ban on the popular news app Telegram All have weakened the president, analysts said. A collapse of the nuclear pact could further weaken Rohani and give more influence to the stubborn opponents of the agreement.
"Rohani is already under tremendous pressure," Iranian analyst Saeid Hasanzadeh said in Istanbul. He said that Iran's supreme leader, Ayatollah Ali Khamenei, who holds the ultimate religious and political authority in Iran, has distanced himself far enough from the nuclear deal that Rohani is being blamed for his failure.
Direct responsibility for the deal, "said Hasanzadeh," So the responsibility lies entirely on Rohani's shoulders. "
William Branigin in Washington contributed to this report.