The EU official leading talks to revive Iran's nuclear deal said Wednesday that he was confident a deal will be reached as negotiations adjourned.
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European diplomats did not sound so upbeat, saying that success was not guaranteed with very difficult issues remaining.
Negotiations resumed May 7 in Vienna, between Iran, Russia, China, France, Britain and Germany, Reuters reported. A delegation from the US is nearby and not directly involved in the talks due to Iran's refusal to deal with it directly.
Former President Donald Trump abandoned the Joint Comprehensive Plan of Action (JCPOA) in 2018, prompting Tehran to begin violating its terms about a year later.
"I am quite sure that there will be a final agreement... I think we are on the right track and we will get an agreement," Enrique Mora, who is coordinating indirect talks between Iran and the United States, told reporters at the end of a fourth round of negotiations.
Talks circle around Iran's agreement to rein in its nuclear program in exchange for relief from economic sanctions imposed on it by the US, EU and UN, Reuters reported.
Diplomats from Britain, France and Germany were more reserved in their assessments of the talks' progress.
"There are still some very difficult issues ahead. We do not underestimate the challenges that lay before us," the three nations, collectively referred to as the E3, said in a statement.
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