Iran and Russia sounded upbeat about talks on salvaging the 2015 Iran nuclear deal on Tuesday, Reuters reported.
Tehran said an accord was possible if other parties showed "good faith" and a Russian negotiator reported "indisputable progress."
An eighth round of nuclear talks between Iran and world power started on Monday with a focus on Tehran’s fuel export and lifting of sanctions.
"The Vienna talks are headed in a good direction... We believe that if other parties continue the round of talks which just started with good faith, reaching a good agreement for all parties is possible," Iranian Foreign Minister Hossein Amirabdollahian told reporters in Tehran.
"If they show seriousness, in addition to the good faith, arriving at a deal soon and in the near future is conceivable," Amirabdollahian said in a video of his remarks on state media.
Russian envoy Mikhail Ulyanov said on Twitter: "We observe indisputable progress... Sanctions lifting is being actively discussed in informal settings" in a working group at the talks.