How did the Central Asian states end up being independent of Russia while other nearby areas like Tuva and Tatarstan were kept inside it?

by LewHen

I'm asking specifically about the Soviet period.

jamaktymerian

Clarifying question: Are you asking why Tuva and Tatarstan were part of the RSFSR and not a separate union republic or are you asking why they weren't independent after the fall of the Soviet Union?