“The next round will definitely start this week, although not necessarily on Friday.
The assessments of the prospects sound different, the restrained statements of both the Iranian side and the American draw attention to themselves, "RIA Novosti quoted him as saying.
Ulyanov stressed that this is due to some issues that are of fundamental importance for the participants in the negotiations.
The Permanent Representative also noted that the parties are determined to achieve a successful completion of the negotiation process.
Earlier, Ulyanov said that a trilateral meeting of the delegations of China, Iran and Russia at the Vienna talks on the Iranian nuclear deal took place.