The Shanghai Cooperation Organization (SCO) was formed in 2001 between China, Russia, and Central Asian countries to promote cooperation in security, economic and cultural issues. It has 6 full members and 4 observer states. The organization has a council structure and focuses on counterterrorism, trade, energy cooperation, and cultural exchanges. While the SCO provides a platform for regional cooperation, its effectiveness is limited by the different priorities of Russia and China, weaknesses in some member economies, and tensions between members, observers, and other international players like the US. The SCO aims to be an important regional actor but has not emerged as a strong military or economic bloc.