Officials said on Thursday they have agreed to a timetable and framework for the talks aimed at reaching a long-term agreement over Iran's nuclear program.
Catherine Ashton, the European Union's foreign policy chief, and Iranian Foreign Minister Mohammad Javad Zarif said that expert-level talks would start next month. Delegations from the United States, the United Kingdom, France, Germany, Russia, China, and Iran will also meet on March 17.
A senior U.S. official told The New York Times that "every issue of concern to us is on the table," including Iran's uranium enrichment and ballistic missiles.
The official added that a final agreement must also make it clear that Iran's nuclear program cannot be used, or intended, for the military.
Speaking at a press conference, Ashton called this week's round of talks "very productive," and said they "identified all the issues we need to address to reach a comprehensive and final agreement."
Meetings have been planned for the next four months, and Ashton could travel to Iran before the March 17 meeting.
Officials reached a six-month interim agreement in November, which was implemented in January. Though the agreement sets the deadline for reaching a final deal on Iran's nuclear program for late July, if officials from all countries involved agree, the timeline can be extended.