I don’t give one sh*t what Stalin did.
If such an argument was even remotely valid, then Ukraine/EU/UK/NATO/US/UN would have no problems whatsoever with the Referenda going on given the US and NATO split apart Serbia to create Kosovo with a referendum and force of arms.
Ukrainian is incessantly demanding and begging for more tanks, planes, artillery assets, military hardware, munitions, billions in money, etc., etc. cause their own military hardware is getting utterly wrecked!
What? Your argument makes no sense.
The fact that countries in a fight for existence routinely ask for as much assistance as they can has nothing to do with various political entities considering some referenda as valid or not.