Leaders of the Group of Seven wealthy nations and members of NATO on Monday reaffirmed a commitment to stop Iran from making nuclear weapons, as diplomats from outside the European Union cautioned that negotiations with the Islamic Republic to salvage the 2015 nuclear deal still need more time.

Axar.az reports citing foreign media that Iranian envoys held another round of negotiations with international delegations in Vienna a day after EU coordinators suggested that differences over the accord limiting Iran’s nuclear activities had narrowed further. But Iranian Deputy Foreign Minister Abbas Araghchi told Iranian state media he thought a deal was unlikely to emerge in the coming week. A diplomat from Russia also said more time was needed to work out details.

The Vienna meetings are aimed at rebuilding the nuclear containment agreement between Iran and major world powers that the Trump administration withdrew the United States from in 2018.