Ranking diplomats from Iran and the European Union have begun a new round of nuclear talks in New York since April 30.
The negotiations, held on the sidelines of the 2015 Review Conference of the Parties to the Treaty on the Non-Proliferation of Nuclear Weapons (NPT), are expected to continue until May 5.
Iranian negotiators Abbas Araqchi and Majid Takht Ravanchi have held several long meetings with the EU deputy secretary general for the external action service, Helga Maria Schmid, over the past days.
The talks will resume today with a session at the level of deputy foreign ministers, preceded by a meeting of experts.
Diplomatic talks on drafting the text of a final nuclear deal will restart in Europe after New York, but the time and venue has yet to be set.
Iran and the Group 5+1 (Russia, China, the US, Britain, France and Germany) are in talks to hammer out a lasting accord that would end more than a decade of impasse over Tehran's peaceful nuclear program.
On April 2, the two sides reached a framework nuclear agreement in Lausanne, Switzerland, with both sides committed to push for a final deal until the end of June.