"(as if there isn't a whole history of mass repression against anti-government and/or pro-independence groups in Western colonies)"

Anything on the scale of what they have done in their colonies?

"part of the five-year plan to improve agricultural output (as if there isn't a whole history of, at the very least, deliberate withholding of resources against colonial population, if not outright use of hunger as an instrument of repression)"

You are missing the point again -- unlike the USSR, western colonial powers didn't do that to their own people.

"or part of the Soviet educational policy"

I have already gave you the link to korenization.