I didn't say KSA is part of the free world, though it is relatively much freer than North Korea.
When war breaks out then nations have three choices, join side A, side B or remain neutral. In World War 3 it is obvious KSA will have to join the American led side, let's call them the allies, while Iran will join the Chinese led side, or the Axis powers. And like the previous two World Wars, the Allies will win again. Freedom always prevails, and authoritarian regimes lose. China should learn this lesson before it is repeated for the third time.