Seyyed Abbas Araqchi, who is also Iran’s deputy foreign minister for legal and international affairs, made the remarks after the two sides ended their first day of the new round of talks in Geneva on Monday.

The Iranian negotiating team is headed by Araqchi and Deputy Foreign Minister for European and American Affairs Majid Takht-e Ravanchi, while Acting Deputy Secretary of State Wendy Sherman leads the US team.

The Iranian official said that the two sides had detailed discussions, including on the US-led sanctions against Iran, during the expert-level meeting.

Araqchi said Iran would also hold one-on-one talks with the other members of the P5+1 group later on Tuesday.

Iran and the P5+1 - Russia, China, France, Britain, the US and Germany - will begin their new rounds of nuclear talks on Wednesday. The two sides failed to reach a final agreement by a previously-set November 24 deadline. Given the progress that had been made, however, Iran and the P5+1 agreed to extend their discussions for seven more months until July 1, 2015. They also agreed for the interim deal they had signed in Geneva in November 2013 to remain in place during the negotiations.