How did it take away national self-determination exactly? The Soviet model regarding self-determination was definitely better than what any other nation had. I probably don't have to mention that Lenin wrote a whole book on national self-determination, defending the right to self-determination on the condition that it does not harm the socialist project.

Although one may call it superficial, a mere formality no indicator of self-determination in the Republic, it is remarkable that the Soviet ruble had 15 local languages printed on the banknote.