Why in 1991 when many republics got independent, so why not siberia?

i dont mind admitting u. s. is not #1 in area but i wonder if siberia really counts for russia. russia stifled its 2014 protest. it seems to be just occupation from the start when russia conquered it to spread east. not willingly joined and now occupation continues?

siberia is just occupied by russia
siberia is part of russia.
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Why in 1991 when many republics got independent, so why not siberia?
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