 Nyorera kupfuurira kweiyi ndima - Mukuwirirana neSoviet-Nazi Molotov-Ribbentrop Chibvumirano chaAugust 23, 1939, Red Army yakapinda muPolandmusi wa17 September 1939, pashure pokupinda kweNazi musi wa1 September 1939. Musi waNovember 30 Mauto Matsvuku akarwisawo Finland, muHondo yeZima ya19391940. Pakazosvika chirimo cha1940, pashure pokukunda chikamu chayo chePoland, Third Reich yakagoverana muganhu wakakura neUSSR, iyo yakaramba isina kwayakarerekera yakabatanidzwa nechibvumirano chavo chisina kurwisa uye zvibvumirano zvokutengeserana. Chimwe chiitiko cheMolotov-Ribbentrop Chibvumirano chaive chinzvimbo cheSoviet cheBessarabia uye kuchamhembe kweBukovina, chakaitwa neSouthern Front muna Chikumi-Chikunguru 1940 uye Soviet chinzvimbo chenyika dzeBaltic 1940. Kukunda uku kwakawedzerawo muganhu weSoviet Union nenzvimbo dzaidzorwa nevaNazi. Nokuda kwaAdolf Hitler, mamiriro ezvinhu akanga asiri dambudziko, nokuti mutemo we Drang nach Osten Kutyaira kuMabvazuva wakachengetedzwa muchivande, uchiguma musi wa 18 December 1940 ne Directive No. 21, Operation Barbarossa, yakatenderwa musi wa 3 February 1941, uye yakarongwa pakati paMay 1941. 