It is not much mentioned in the US media, but the lifting of the UN sanctions opens the door for Iran to become a full member of the Shanghai Cooperation Organization(SCO). Iran has long held observer status in SCO and sponsored by Russia for full membership. It is also said that Pakistan and India will also soon become full members in SCO.
Iran also has the potential to become a member of the Russian led Collective Security Treaty Organization.
Bear, Dragon, and Eagle: Russian, Chinese, and U.S. Military Strategies