US President Donald Trump Friday opted to extend sanctions relief provided to Iran as part of the 2015 nuclear deal, but he warned European allies that he would pull out of the pact unless its "terrible flaws" are corrected.
"We are gradually coming to the conclusion that an internal decision by the U.S. to leave the (Joint Comprehensive Plan of Action) has already been made or is close to being made", Ryabkov said in an interview with Interfax news agency.
In his lengthy statement, Trump said the US would work with European partners to remove the nuclear deal's so-called "sunset clauses", which allow Iran to gradually resume advanced atomic activity.
"In the absence of such an agreement, the United States will not again waive sanctions in order to stay in the Iran nuclear deal".
Iran's president said on Sunday the United States had failed to undermine a nuclear deal between Tehran and major powers, and hailed the accord as a "long-lasting victory" for Iran, state television reported.
The US still maintains sanctions on Iran - independent of the nuclear deal - on matters such as terrorism, human rights and ballistic missile development.
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"No one should doubt my word", Trump said in a harshly worded, two-page statement that also announced separate economic sanctions on 14 Iranian entities and individuals.
He further claimed, "This is a last chance".
Trump is required to renew the existing deal every 120 days under USA law.
Russian Federation spoke out strongly Friday in favor of the accord, ahead of the announcement of Trump's decision, calling it "the result of a consensus among many parties", in the words of Kremlin spokesman Dmitry Peskov.
"So Trump now has issued explicit May deadline to Congress and Europeans: Fix Iran nuke deal or no more sanctions waivers", wrote Mark Dubowitz, head of the Foundation for Defence of Democracies.
His statement came a day after the European Union's foreign policy chief, Federica Mogherini, together with foreign ministers of France, the United Kingdom and Germany delivered a strong defense of the deal in separate statements, which were issued following a meeting with Zarif in Brussels.
Britain, France and Germany had called on Trump on Thursday to uphold the pact.