"Negotiations with United States held in much serious atmosphere than before," said Araghchi.
He said that the "Next round of talks to be held with US envoy Steve Witkoff."
He continued to say that "We have reached a point where we have to discuss detailed nuclear negotiations ."
"Talks were only limited to nuclear issues, removal of sanctions," he continued.
"There are still differences on the general issues and the details," Araghchi said, adding that "Our optimism is extremely cautious."
"Some of our differences are serious and some are less serious. I think our progress so far has been good. We are satisfied with the progress of the negotiations. Both sides are serious," he added.
"I'd like to make it clear that the topic of the negotiations is the nuclear issue and we will not accept any other issue," Iran's lead negotiator said.
MNA
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