All measures taken by Iran to scale back its commitments to a 2015 nuclear deal were "reversible" if the European signatories of the pact fulfilled their obligations, Foreign Minister Mohammad Javad Zarif tweeted on Sunday.
Iran said on Sunday it was fully prepared to enrich uranium at any level and at any amount, in further defiance of US efforts to squeeze the country with sanctions and force it to renegotiate the nuclear deal with world powers.
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"Today, Iran is taking its second round of remedial steps under Para 36 of the JCPOA. We reserve the right to continue to exercise legal remedies within JCPOA to protect our interests in the face of US #EconomicTerrorism. All such steps are reversible only through E3 compliance," Zarif tweeted.
Meanwhile, Britain issued a warning to Iran on Sunday to "immediately stop and reverse all activities" violating the 2015 nuclear deal with world powers.
The British Foreign Office issued its warning after Tehran's announcement that it would break the 3.67% uranium enrichment limit set in the pact. The move comes after the US withdrew from the agreement last year and restored crippling sanctions on Iran.
Britain's Press Association quoted a ministry spokesman as saying: "While the UK remains fully committed to the deal, Iran must immediately stop and reverse all activities [that are] inconsistent with its obligations."
The spokesman said Britain is coordinating with other countries that are part of the accord "regarding the next steps under the terms of the deal, including a joint commission."
Earlier Sunday, the European Union said parties to the 2015 Iran nuclear deal were discussing a possible emergency meeting after Iran's announcement that it will overstep the accord's limit on uranium enrichment.
EU spokeswoman Maja Kocijančić said that the bloc was "extremely concerned" about Iran's decision to ramp up enrichment beyond the 3.67% limit. She said the EU has warned Iran against such moves.
Amid growing tensions in the region, Kocijančić told The Associated Press that the EU was in contact with other parties to the accord to discuss the next steps, "including a joint commission."
The agreement's joint commission brings together officials from the participating nations – Iran, France, Germany, Britain, Russia, China and the EU. The US pulled out of the accord last year.
Germany said Sunday it was "extremely concerned" about Iran's announcement.
The German Foreign Ministry said in a statement on Sunday that it was awaiting further information from the UN atomic watchdog.
The ministry called on Iran "to stop and reverse all activities inconsistent with its commitments" and said it was in contact with remaining parties to the deal regarding the next steps to try keep Iran within the terms of the agreement.
The US unilaterally withdrew from the deal a year ago.
