Another point: would Russian really be comfortable extending their economic alliance to big muslin countries like Iran? As far as I remember, the alliance included a free-movement zone. Wouldn't the Russians be wary of this? Similar to how the Americans would be wary to create a free-movement zone with Mexico? Even worse, cuz there are more serious religious and anti-terror concerns in the relation between Russia and muslin countries, even allies like Iran.More or less, until the 2008 financial crisis, China was in no shape to challenge Russian influence in Mongolia, a former Russian/Soviet Puppet. They're diverting their attention to the south towards Nepal, Bhutan, Burma, Laos, and Vietnam.
Russia is very rich now, I see a lot of people from Iran planning to move.