Russia on the SCO Expansion

Iran, Belarus and other countries expected to become full members of the Shanghai Cooperation Organization, will not join it in the foreseeable future.

The reason is the organization's need to address economic integration of Central Asia and creation of a common sphere of humanitarian regional cooperation. This was evident from the meeting of SCO foreign ministers' council, held in Shanghai a month before its anniversary summit. The SCO will celebrate its 5th anniversary simultaneously with the 10th anniversary of its predecessor, annual summits on common border security.

It was the anniversary that prompted SCO member states to realize that without clearly defined borders of the region, the organization will fall into a crisis, when geopolitical games hinder its real efficiency.

From here.

We'll see what the Chinese say.