Iran will resume stalled talks with global powers aimed at reviving the country’s ailing nuclear deal on November 29, as concerns grow over the scale of Tehran’s atomic activity.

Representatives from China, France, Germany, Russia and the UK will convene with Iran at a Vienna meeting chaired by the EU, Tehran and Brussels said on Wednesday, in a bid to salvage diplomatic negotiations over the pact and find a way for the US to rejoin the agreement.

Tehran said last month that it was prepared to restart the international talks. Restoring the 2015 JCPOA nuclear accord with Washington’s involvement and a reduction in Iran’s atomic activity to levels outlined in the original pact could result in the lifting of many sanctions against the Islamic republic.