There has been progress in reaching desirable approaches, yet we have to work on some important issues, Zarif said on the sidelines of the talks, Fars news agency reported March 29.
Sources close to the negotiating sides have said that sanctions and research and development remain the main topics on which common ground has yet to be found.
Zarif and Kerry met in Lausanne, Switzerland. Washington said that the US secretary of state has discussed Yemen’s ongoing political developments with Zarif.
Iran and the group 5+1 (the US, UK, France, Russia, China, and Germany) are in talks over Tehran’s nuclear program.
High Representative of the European Union for Foreign Affairs and Security Policy Federica Mogherini is also attending the negotiations.
The sides have agreed to reach a political understanding on the case by the end of March.
The sides have also agreed to strike a comprehensive deal by July 1.
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