"We haven't finished yet. A few [obstacles] remain. We will continue [negotiations]," de Riviere said.
Lausanne is holding the latest round of talks on Tehran's nuclear program. Iran's chief negotiator, Deputy Foreign Minister Abbas Araqchi, stated that a plenary session with participation of foreign ministers of P5+1 and Tehran would take place Monday.
P5+1 group, comprising Russia, the United States, the United Kingdom, France, China and Germany, and Iran have been holding negotiations on Tehran's nuclear program since November 2013. The West accuses Tehran of trying to develop nuclear weapons, a claim Tehran repeatedly rejected.
A new round of P5+1 talks with Tehran began in Lausanne Thursday, and is expected to continue until March 31, according to a source in Iranian delegation.
