Iran's Deputy Foreign Minister Abbas Araqchi said that the first session of a two-day meeting in Geneva with the US has been "constructive".
"Negotiations between Iran and the US in the Swiss city of Geneva were held in a positive and constructive atmosphere," Press TV quoted Araqchi as saying Monday.
The meeting commenced Monday and would continue Tuesday.
Other than the nuclear issues, the sanctions imposed on Iran by the US would also be discussed during the meetings, Araqchi said.
The American delegation was headed by US Deputy Secretary of State William Burns.
The meeting comes ahead of the next round of nuclear talks between Iran and the P5+1 or the five permanent members of the UN Security Council - the US, China, Russia, France, Britain - plus Germany scheduled for June 16-20 in Vienna.
Also present at the meeting was Helga Schmid, deputy to European Union (EU) foreign policy chief, Catherine Ashton.
