The SCO is being revised at the moment to become a NATO style defense pact. This would mean an attack on Iran will instantly trigger WW3 if approved.
How far along this process are we is not sure, already the SCO provides al ltechnical and industrial/financial support for any member in the state of war.

Here's an example of SCO agreements now https://image.nostr.build/3265aabead7ae3b9e604e41dc8d9c7e8ed265c0ab4dad557734ac8d1ad8d2067.jpg