Iran’s officials met French counterparts in Paris for 10 hours on Monday over the 2015 nuclear deal and tensions between Tehran and the US.

The Iranian embassy in France tweeted about the talks involving Deputy Foreign Minister Abbas Araqchi. Earlier on Monday, Government spokesman Ali Rabaei said views with France are drawing closer after phone calls between President Hassan Rouhani and French counterpart Emmanuel Macron.

The French Foreign Ministry said only that “a delegation, including experts of the ministry of economy” are conducting negotiations with Iran to reduce tensions.

Macron launched a mediation effort in early July, after Iran began suspending commitments under the deal with the remaining 5+1 Powers — France, Germany, the UK, China, and Russia — and Donald Trump ordered but then withdrew US airstrikes inside the Islamic Republic.

Complaining that Europe has not established a proper mechanism for bypassing comprehensive US sanctions, Iran has already broken the deal’s limit on stocks of 3.67% uranium, raised enrichment to 4.5%, and resumed construction of the Arak heavy-reactor, halted under the agreement pending a redesign to prevent by-product of plutonium, which can be used for nuclear warheads.

In February, the European Union launched a mechanism, INSTEX, to bypass US sanctions with non-dollar trade in Iranian oil and other commodities and goods. But Tehran’s leadership refused the arrangement because of “humiliating conditions”: the EU’s concern over missiles, Iran’s activities in the Middle East, and alleged involvement in bomb and assassination plots in Europe.

Macron has offered a $15 billion line of credit to Tehran. An Iranian official said Tehran will consider reversing its suspension of commitments under the nuclear deal if the line is established — but went no further over new discussions on missiles and Iran’s military and political activities in the Middle East.

Iranian Foreign Minister Mohammad Zarif told reporters in Tehran on Sunday, “Iran’s negotiations with the Europeans will continue….If the Europeans fail to carry out necessary measures by Thursday, we will write a letter to the Europeans…announcing the implementation of the third step.”

Zarif did not specify which provision will be broken, but officials — including President Hassan Rouhani — have indicated that Iran will return to its pre-2015 enrichment of 20% uranium, which potentially can be further enriched to 90% grade for use in a military nuclear program.