Iran's top leader Ayatollah Ali Khamenei has set out a series of conditions on for European powers if they want Tehran to stay in the nuclear deal, including steps to safeguard trade with Tehran and guarantee Iranian oil sales.
Iran informed the United Nations nuclear watchdog on Tuesday that it will increase its nuclear enrichment capacity within the limits set by the 2015 agreement.
Earlier on Monday, Iran's Supreme Leader Ayatollah Ali Khamenei hinted at the move by warning European leaders against their "dream" of Tehran continuing to curb its nuclear programme while finding itself under new economic sanctions.
Israeli Prime Minister Benjamin Netanyahu embarks Monday on a three-day European tour in Germany set to be dominated by strategic differences on Iran, as leaders attempt to rescue the nuclear deal after U.S. withdrawal.
The Iran deal paved the way for the partial lifting of global sanctions against the country, in exchange for Tehran curbing its nuclear programme for a number of years.
The US, however, withdrew from the accord last month, emboldening Israel in its efforts to try to kill the deal and rally more support for its anti-Iran campaign.
On Tuesday, Mr Netanyahu met French President Emmanuel Macron in Paris for talks, in a bid to convince European signatories - Britain, France and Germany - to pull out of the 2015 Iran nuclear deal. The UF6 is a feedstock for centrifuges.
Netanyahu has been a staunch opponent of the Iranian nuclear deal and has repeatedly called for it to be scrapped and for a return of sanctions.
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President Donald Trump announced on May 8 that he was pulling the United States out of the 2015 Iran nuclear deal, arguing that the worldwide accord was not in America's "national interest". We commit, and I commit again, that we will not let that happen, ' he said.
State Department spokeswoman Heather Nauert declined to respond to Tehran's seeming threat to start enriching more uranium.
That document, examined by The Times, is dated by Israel to 2001 and authorizes the Iranian military to enrich uranium hexafluoride (UF6) by centrifuges from three percent to more than 90 percent - levels which suggest that Iran meant to build a nuclear weapon.
Israeli Prime Minister Benjamin Netanyahu called the tweet "quite extraordinary" while the Israeli Embassy in the US had a different response.
Iranian officials maintain they have no interest in developing nuclear weapons, and in fact Khamenei claimed Islamic law prohibits the construction of nuclear bombs during his remarks.
"We are not surprised", he said.
The Israeli leader said Tuesday that the Iranian plan to increase its nuclear enrichment capacity was aimed at producing nuclear weapons to be used against Israel.
The JCPOA allows Iran to pursue a peaceful nuclear program for commercial, medical and industrial purposes in line with global non-proliferation standards.