He wrote in his Twitter account on Sunday that "This afternoon I held a constructive & fruitful meeting with Russian & Chinese chief negotiators.
We shared ideas about how to proceed & also coordinated our positions about several issues.
We will continue our intensive & serious engagement to reach a good deal.
The latest round of Vienna talks started here last Thursday.
During the negotiations held with the member states of the Joint Commission of Joint Comprehensive Plan of Action (JCPOA) namely China, Russia, Britain and France, Iran mainly seeks removal of anti-Iran sanctions.
