Iran on Monday breached a uranium enrichment cap set by a troubled 2015 nuclear deal and warned Europe against taking retaliatory measures, as France decided to send an envoy to Tehran to try to calm tensions.

The move came more than a year after Washington pulled out of the landmark accord between world powers and Tehran, which says it has lost patience with perceived inaction by the remaining European partners.

After Tehran’s latest step, US President Donald Trump held talks with his French counterpart Emmanuel Macron on “ongoing efforts to ensure that Iran does not obtain a nuclear weapon and to end Iran’s destabilising behaviour in the Middle East,” the White House said in a statement.

Iran surpassing the cap and reaching 4.5% enrichment was announced by the country’s atomic energy organisation spokesman Behrouz Kamalvandi.

“This level of purity completely satisfies the power plant fuel requirements of the country,” he said, quoted by the semi-official ISNA news agency.

Kamalvandi hinted that the Islamic republic might stick to this level of enrichment for the time being, which is well below the more than 90% level required for a nuclear warhead.

The UN nuclear watchdog, the International Atomic Energy Agency (IAEA), confirmed that Iran had enriched uranium to a level above the deal’s cap.

The IAEA said its inspectors “on 8 July verified that Iran is enriching uranium above 3.67% U-235.”

The European Union said it was “extremely concerned” by the development and called on Iran to “reverse all activities” inconsistent with its deal commitments.

France, Germany and Britain – the European partners of the international deal – also urged Tehran to halt its advance towards breaching the cap, as Paris said it was sending a special envoy to Tehran on Tuesday and Wednesday to try and “de-escalate” tensions.

 ‘Skip next steps’

Iran’s Foreign Ministry warned against any escalatory response.

If the Europeans “do certain strange acts, then we would skip all the next steps [in the plan to scale back commitments] and implement the last one,” ministry spokesman Abbas Mousavi said.

He did not specify what the final step would be but President Hassan Rouhani had warned previously that Iran could leave the nuclear accord.

Foreign Minister Mohammad Javad Zarif reiterated that Iran’s actions could be reversed if European partners deliver on their part, insisting there was no better pact than the 2015 deal, of which he was a key architect.

“As it becomes increasingly clear that there won’t be a better deal, they’re bizarrely urging Iran’s full compliance. There’s a way out,” he tweeted.

– Agence France-Press