The limits were agreed by Iran and six other parties that signed the 2015 Joint Comprehensive Plan of Action (JCPOA): Britain, China, France, Germany, Russia and the United States, which last year pulled out of the deal.

Here is a roundup of major reactions so far on Wednesday to Iran's announcement.

- Implement deal: Russia -

Russian Foreign Minister Sergei Lavrov said European signatories were trying to "divert attention" from their inability to implement points of the 2015 agreement.

"We will call on them, as we have done before, to concentrate on implementing everything that is enshrined in the JCPOA," he said.

- 'Avoid escalation': China -

"We call on all relevant parties to exercise restraint, strengthen dialogue, and avoid escalating tensions," said Chinese foreign ministry spokesman Geng Shuang. He said China "resolutely opposes" unilateral US sanctions against Iran.

- Israel 'won't allow' weapon -

"We shall not allow Iran to obtain a nuclear weapon," Israeli Prime Minister Benjamin Netanyahu, who backed US President Donald Trump's decision to pull out of the 2015 accord, said in an address.

- Germany: 'full implementation'-

Berlin wants to keep alive the agreement, said German Chancellor Angela Merkel's spokesman Steffen Seibert, adding: "We as Europeans, as Germans, will play our part and we expect full implementation from Iran as well."

- Britain: 'unwelcome step' -

"Today's announcement from Tehran is... an unwelcome step. We urge Iran not to take further escalatory steps and to stand by its commitments," British Foreign Office minister Mark Field told parliament.