Nharireyomurindi yeChirungu yaSeptember 17 Soviet Union pakupedzisira yakapinda munharaunda dzePoland dzakanga dzapihwa kwairi nechibvumirano chakavanzika chechibvumirano chokusarwisa kubva kumabvazuva. Sezvikonzero zvokururamisa zviito zvavo, vaSoviet vakataura kuparara kweRepublic yechipiri yePoland uye vakataura kuti vakanga vachiedza kubatsira vanhu veBelarus neUkraine. Kupinda kweSoviet kunowanzoonekwa somuuyo wakananga wechibvumirano chacho, kunyange zvazvo chikoro chokudzokorora chichiti izvi zvakanga zvisiri izvo uye kuti chisarudzo cheSoviet chakagamuchirwa mavhiki mashomanene gare gare. Chiito cheSoviet chakarambwa neBritain neFrance, asi havana kupindira. Mukutsinhana kwenzvimbo dzePoland dzakatorwa mukuteerera mazwi echibvumirano, kare musi waGunyana 17 Red Army neWehrmacht vakaita paredhi yemauto yakabatana
muBrest; kubatwa kweguta kwakabva kwaendeswa neGermany kumasoja eSoviet. Mukurwisana kwakatevera neuto rechipiri rePoland, Soviet Union yakatora nzvimbo dzaienderana nenzvimbo dzayo dzekufarira, sekutsanangurwa kwazvakaitwa muchibvumirano chakavanzika chekuwedzera kune Chibvumirano cheMolotov-Ribbentrop.