US President Donald Trump's speech outlining a new strategy against Iran violated the 2015 nuclear agreement, Foreign Minister Mohammad Javad Zarif said.
Trump's virulent speech contravened three articles of the 2015 deal, Zarif said in televised remarks broadcast late on Saturday.
They include the requirement to implement the accord "in good faith" and for the US to "refrain from re-introducing or reimposing" sanctions related to Iran's nuclear program.
"I have already written nine letters (to EU foreign policy chief Federica Mogherini) listing the cases where the United States has failed to act on or delayed its commitments under the JCPOA," Zarif said, using the technical name for the nuclear deal.
Mogherini helped negotiate the nuclear deal alongside the US, Britain, France, Germany, China and Russia.
Zarif said he would write a new letter regarding Trump's speech last Friday, and warned of a "reciprocal measure" if sanctions were reimposed.
In his speech, Trump refused to "certify" the nuclear deal and warned he would "terminate" the deal unless Congress introduced tough new sanctions against Iran's missile and nuclear programs, as well as its "destabilizing" activities in the Middle East.
Zarif responded by saying: "Our achievements in the field of ballistics are in no way negotiable.
"We live in a region into which hundreds of billions of dollars of lethal American weapons have poured, turning it into a gunpowder storehouse... so we have the right to have defensive means," he said.
Trump in no position to verify Iran’s compliance
Zarif also said Trump is in no position to verify Iran’s compliance with the nuclear deal, asserting that quitting the deal is among Tehran's options.
He further noted that regulations within the American government are not related to Tehran and the US must honor its international commitments under the agreement.
“The American domestic regulations are not credible for us and the US is required to remain committed to its international commitments. The JCPOA is not an agreement between Iran and the US to need Congress certification,” he said.
“The United States is isolating itself by its policies,” Zarif said, citing the European Union’s concerns about the “Trump administration’s behavior,” which is not “exclusively” limited to the nuclear agreement and “could cause trouble for the international order.”
He also highlighted Trump's failure to respect several other international deals such as the Paris Climate Accord, North American Free Trade Agreement (NAFTA), and Trans-Pacific Partnership (TPP).
Iran to stop Additional Protocol if JCPOA nixed
Head of the Atomic Energy Organization of Iran Ali Akbar Salehi said the country would no longer abide by the Additional Protocol of the Non-Proliferation Treaty if the nuclear deal fell apart.
The protocol allows unannounced inspections by the UN nuclear watchdog, the International Atomic Energy Agency (IAEA). Iran agreed to implement it as part of the nuclear deal, without turning it into law.
"Without the nuclear agreement its application is meaningless," Salehi said.
He also repeated his warning that Iran could very quickly return to the production of highly enriched uranium if the US reimposed sanctions.
"If one day, the authorities of the country conclude that the nuclear agreement is no longer to the benefit of the country and decide to resume 20 percent enrichment we can do so within four days," he said.
UK, Germany 'committed to Iran nuclear deal
Britain and Germany agreed on Sunday they remained committed to the nuclear deal, a spokeswoman said after a call between Prime Minister Theresa May and German Chancellor Angela Merkel.
“They agreed the UK and Germany both remained firmly committed to the deal,” the spokeswoman said in a statement.
France urges US Congress not to cancel JCPOA
French Foreign Minister Jean-Yves Le Drian urged the US Congress not to rip up the Iran nuclear deal.
"We strongly hope that Congress, which is now responsible for a possible rupture, does not jeopardize the deal," Le Drian said.
"If we denounce a deal that has been respected, it will set a dangerous precedent," particularly in the context of negotiations with North Korea, Le Drian said, echoing other signatories of the Iran deal Britain, France, Germany, China and Russia.
The Republican-controlled Congress will now have to decide whether to reimpose sanctions on Iran – a step that if taken would almost certainly doom the agreement.
"For us, the Vienna accord is a good accord... It is robust and coherent," said Le Drian.
Asked if Europeans would be willing to impose sanctions against Iran's powerful Revolutionary Guards Corps, as Trump has requested, Le Drian said "we can talk about it".
Tillerson: Staying in Iran deal in best interest of US
US Secretary of State Rex Tillerson said Sunday he believes staying in the Iran nuclear deal is in the best interest of the US.
During an interview on CNN's "State of the Union," Tillerson was asked whether he agrees with Defense Secretary James Mattis that he would not want Congress to immediately impose sanctions that would end the multilateral deal.
"I do agree with that," Tillerson said. "And I think the president does as well."
Tillerson said the US will see if it can address the “flaws” in the Iran nuclear deal by staying within the agreement and working with the country's friends and allies.
"That may come in a secondary agreement as well," Tillerson said.
He said the US wants to fully enforce the agreement as it exists and "then begin the process of addressing the flaws."
US to stay in deal
US Ambassador to the UN Nikki Haley said the United States for the time being will stay in the international nuclear deal with Iran, adding that the Trump administration wanted to weigh a "proportionate" response to Tehran.
"I think right now, you're going to see us stay in the deal. Because our hope is that we can improve the situation. And that's the goal," Haley said.
AFP, Reuters and Press TV contributed to this story.