The European Union coordinator for the Iran nuclear talks will travel to Tehran on Saturday to meet Iran's chief negotiator, he said on Friday.
"Closing remaining gaps to Iran nuclear talks, must conclude this negotiation. Much is at stake," Enrique Mora, the coordinator, said on Twitter.
The talks were close to an agreement until Russia made last-minute demands of the United States, insisting that sanctions imposed on Moscow over its invasion of Ukraine would not hurt its trade with Iran.
Iran Foreign Minister Hossein Amirabdollahian said on Thursday that the vital issue of sanctions relief for Iran was not yet fully resolved.
