Because its not relevant. It HAPPENS to be the case now,
It IS relevant because its the fundamental reason why we can say we'll get positive outcomes from this case. It was even baked into your explanation "ending global imperialism".
but the framing of "big vs small" is very ignorant
"Framing" is ambiguous and I'm ignoring that,
This makes your analogy make less sense. No nazi party came to power in the donbass. In fact they precieved that had happened in keiv and seceded.