Sometimes I wonder why Stalin made such a decision. Maybe he was affraid of havin Poland within Soviet Union.==
Same way for Bulgaria, Romania, Hungary, even Mongolia.
It was done because in those countries like in you Poland you have your own socilait - communist cadres so your national communists-socialists.
BUT in Russia there wasn't NATIONAL commies but only international.
You don't know but I remember the time when it was no good to tell that you are russian in Soviet Union.
You had to tell "soviet" instead.
Outside of USSR they called any soviets as "russian" even continue to do this today for variety of reasons mostly because it is convinient to blame "russians" but embelish themselves (as you poles do).
But inside of USSR it wasn't good to tell about russians only "soviets". It was considered as nationalistic so it was against soviet power to emphasize that you are russian nationalist. I presume there wasn't that in Poland?
So to call yourself ukranian was OK in USSR. National mainorities was OK.
Why that?
Russians in mass fought on side of White movement in Civil war so russians was unreliable for commie power in USSR but minorities was usual commie allies during Civil war 1917-22. SO russians are unreliable almost all history of USSR.
"It was done because in those countries like in you Poland you have your own socilait - communist cadres so your national communists-socialists."
There were communists in pre-war Poland, but they were so few that they had no chance not only of gaining power, but even of arising as an important political party.
BUT in Russia there wasn't NATIONAL commies but only international."
Ha ha ha. Make it clear Ivan, who you mean exactly: Jews? Are Jews responsible for the USSR?