Vienna, 4 August 2022 (dpa/MIA) - Talks aimed at reviving the international nuclear deal with Iran resumed in Vienna on Thursday. After months of deadlock among the sides, the fresh negotiations are an effort to salvage the 2015 agreement, officially called the Joint Comprehensive Plan of Action (JCPOA). EU chief negotiator Enrique Mora is coordinating the negotiations. Western diplomats see only a brief window of opportunity of a few weeks to potentially salvage the pact, whose aim has always been to keep Iran from building nuclear weapons. There were no immediate signs of a breakthrough in Thursday's talks. The delegations - including diplomats from Germany, France, Britain, Russia and China - are discussing a draft proposal made back in March which has been modified slightly recently. The Iran nuclear agreement, when fully implemented, aims to curb Iran's nuclear programme, in exchange for sanctions relief. But talks between Iran and the six other parties to the agreement – China, Germany, France, Britain, Russia and the United States – have faltering for months. dpa has learned that the new version being discussed should take into account nuclear advances that Tehran has made in recent months, some of which would be needed to be walked back. In that time, Iran has proceeded with uranium enrichment to the level of 60%, well above the 3.6% permitted under UN resolutions. On Monday, Iran's nuclear chief Mohammed Eslami again claimed that his country could already build a nuclear bomb but does not want to. Another point of contention is the issue of lifting US-imposed sanctions and the status of Iran's Revolutionary Guard (IRGC), which the United States has listed as a terrorist organization. "The Onus is on those who breached the deal & have failed to distance from ominous legacy," the leader of the the Iranian delegation, Kani Bagheri, tweeted. "The US must seize the opportunity offered by the JCPOA partners’ generosity; ball is in their court to show maturity & act responsibly," he added. The US special envoy for Iran, Robert Malley, tweeted that Washington's "expectations are in check, but the United States welcomes EU efforts and is prepared for a good faith attempt to reach a deal. It will shortly be clear if Iran is prepared for the same." Iranian President Ebrahim Raisi has called for the lifting of all the sanctions imposed by the United States following its unilateral withdrawal in 2018 from the nuclear deal during the presidency of Donald Trump. Tehran has repeatedly insisted that the nuclear deal is of no value to the country if sanctions cannot be lifted. The fresh talks come shortly after the International Atomic Energy Agency (IAEA) warned that Iran is only weeks away from producing the materials necessary to build a nuclear bomb. Tehran has consistently argued that it only intends to use nuclear energy for peaceful purposes.