Iran Foreign Minister Mohammad Javad Zarif and his Russian counterpart, Sergey Lavrov, have held a bilateral meeting in the Swiss city of Geneva, Press TV reported.
Russian Foreign Minister Sergey Lavrov arrived in Geneva on Friday afternoon to join the nuclear talks. Chinese Foreign Minister Wang Yi also plans to head to Geneva to join the negotiations amid reports that the talks may extend to a fourth day.
The negotiations, which started on Wednesday, have been initially scheduled to end on Friday.
Meanwhile, informed sources say, depending on the results of the Friday meetings, the foreign ministers of the US and the three European countries are also very likely to head to Geneva for the talks.
Iran and the five permanent members of the UN Security Council plus Germany kicked off their latest round of talks on Wednesday.
The two sides are working to hammer out an interim deal to pave the ground for the resolution of the West's decade-old standoff with Iran over its nuclear energy program.