The United States cannot unilaterally cancel the 2015 nuclear deal between Iran and world powers, EU foreign policy chief Federica Mogherini said on Friday in reaction to President Donald Trump's decision not to certify the accord.
"We cannot afford as the international community to dismantle a nuclear agreement that is working," said Mogherini, who chaired the final stages of the landmark talks.
"This deal is not a bilateral agreement ...The international community, and the European Union with it, has clearly indicated that the deal is, and will, continue to be in place," Mogherini told reporters.
Mogherini said she spoke to U.S. Secretary of State Rex Tillerson immediately after Trump's speech on Friday.
French President Emmanuel Macron assured Iranian President Hassan Rouhani of France's commitment to the nuclear deal, Macron's office said.
Macron told Rouhani that the U.S. decision not to certify the agreement would not end it and that France and its European partners would keep carrying out their commitments in regard to the deal, a statement said.
Macron also spelled out in a phone conversation the conditions Iran must comply with, including strict respect of the deal.
The chief of the UN atomic watchdog reiterated on Friday that Iran was under the world's "most robust nuclear verification regime" after Trump struck a blow against a 2015 Iran nuclear deal, in defiance of other world powers.
"The nuclear-related commitments undertaken by Iran under the JCPOA are being implemented," Yukiya Amano, director general of the International Atomic Energy Agency said.
Meanwhile, the leaders of France, Britain and Germany warned the United States against taking decisions that could harm the Iran nuclear deal such as re-imposing sanctions.
The three leaders also said in a joint statement that they shared the U.S.' concerns over Iran's ballistic missile program and regional destabilizing activities and were ready to work with Washington to address those concerns.
Russia's foreign ministry said after Trump's speech that there was no place in international diplomacy for threatening and aggressive rhetoric, and such methods were doomed to fail.
The ministry said in a statement Trump's decision to decertify an international deal on Iran's nuclear program would not have a direct impact on implementation of the agreement, but that it ran counter to its spirit.
The ministry said that, whatever the U.S. position, there could be no return to imposing United Nations sanctions on Iran.
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