▁Poland ' s ▁post war ▁borders . ▁▁ ▁St alin ▁ins isted ▁that ▁the ▁territ ories ▁an nex ed ▁by ▁the ▁S ovi ets ▁in ▁ 1 9 3 9 , ▁which ▁had ▁millions ▁of ▁Pol es ▁in ▁addition ▁to ▁Ukrain ian ▁and ▁Bel arus ian ▁populations , ▁should ▁remain ▁in ▁Soviet ▁hands , ▁and ▁that ▁Poland ▁should ▁be ▁compens ated ▁with ▁lands ▁to ▁be ▁an nex ed ▁from ▁Germany . ▁ ▁M iko ł aj czy k , ▁however , ▁refused ▁to ▁comprom ise ▁on ▁the ▁question ▁of ▁Poland ' s ▁so vere ig nt y ▁over ▁her ▁pre war ▁eastern ▁territ ories . ▁A ▁third ▁matter ▁was ▁M iko ł aj czy k ' s ▁ins istence ▁that ▁St alin ▁would ▁not ▁set ▁up ▁a ▁Commun ist ▁government ▁in ▁post war ▁Poland . ▁ ▁In ▁contrast , ▁Tom asz ▁Ar cis zew ski , ▁who ▁had ▁succeeded ▁M iko ł aj czy k ▁as ▁Prime ▁Minister , ▁had ▁announced ▁in ▁ 1 9 4 4 ▁that ▁Poland ▁did ▁not ▁wish ▁to ▁an nex ▁Bres lau ▁or ▁St ett in , ▁but ▁at ▁most ▁wanted ▁East ▁Pr uss ia ▁cleared ▁of ▁its ▁German ▁inhabitants . ▁ ▁Post war ▁history ▁ ▁M iko ł aj czy k ▁and ▁his ▁colle agues ▁in ▁the ▁Polish ▁government - in - ex ile ▁ins isted ▁on ▁making ▁a ▁stand ▁in ▁the ▁defense ▁of ▁Poland ' s ▁pre - 1 9 3 9 ▁eastern ▁border ▁( ret aining ▁its ▁K res y ▁region ) ▁as ▁a ▁basis