Foreign Minister Mohammad Javad Zarif on Sunday conferred with three European foreign ministers at Palais Coburg in Vienna, IRNA reported.
Deputies for the foreign minister, Majid Takht-e Ravanchi and Abbas Araqchi, EU Foreign policy chief Catherine Ashton and the Presidentˈs special assistant Hossein Fereydoun are also present in the meeting.
Removal of differences over text of the Comprehensive Agreement is top on the agenda of the meeting with French Foreign Minister Laurent Fabius, German Foreign Minister Frank-Walter Steinmeier and UK Foreign Secretary William Hague.
Earlier, Zarif met with the Chinese deputy foreign minister.
US Secretary of State John Kerry and UK foreign secretary and French and German foreign ministers arrived in Vienna Sunday morning to explore ways to remove the differences over the text of the Comprehensive Agreement.