Poland annexed soviet territories in 1920. Those territories were inhabited by ukrainians and belarusians, whose language was banned and were oppressed. Polish settlers were brought from western Poland to “polishize” the region. These settlers were given control of all the natural resources and capital, while the natives were enslaved to them. Poland was also a fascist regime. Communists were imprisoned or shot. In 1934, Poland signed a non aggression pact with Hitlers Germany, cementing an alliance that would last until 1939. In 1938, Poland and Nazi Germany jointly invaded Czeckoslovakia and split the country. Plans were also made for a joint polish german invasion of the USSR. These plans lasted until Molotov Ribbentrop was signed, making the germans invade Poland instead. The USSR didnt “invade” Poland, it liberated it. The fascist government was deposed and communists brought to power. They rebuilt Poland from the ruins of WW2 and brought progress to the nation. Antisemitism was erradicated and abortion was legalized. The USSR helped Poland even though it had no reason to.