SCO or any other organization has value as long as it does not interfere with that formula of 1945 (Arab Wealth and Jewish Brain). it is the word "And" not or. China already supported UAE over Iran in Island issue even though UAE is not part of SCO.Russia and China have already allowed a SCO member to be beaten up in front of the whole world, without consequences. And not only to beat up, but also to squeeze a healthy piece of territory and organize ethnic cleansing on it. Do you know Nagorno-Karabakh?
They allowed, of course, not the United States and Israel, but Azerbaijan, which is much inferior to them in capabilities. This, in general, showed the real value of the SCO.
This CSTO or CIS were created much earlier than the new demographic Elite formation inside Russia. CSTO has some work done in Tajikistan civil war and Kazakhstan but its real Aim now is protect from Europa and its culture.