"That agreement (in Vienna) could open the gates for widening military-technical cooperation between Iran and Russia," Mehdi Sanaei wrote in his Live Journal blog.
He cited the recent order of Russian President Vladimir Putin to lift the ban of supplying Iran with the S-300 anti-aircraft systems as a step in that direction.
Bilateral trade may reach 10 billion US dollars following the lifting of the UN sanctions, the diplomat added.
Meanwhile, the diplomat said Tehran was not going to expand its dialogue with Washington despite the Vienna success, Xinhua reported.
Sanaei noted that Iran has no intention to discuss bilateral, regional and global issues with the US as their political courses frequently contradict each other.