Rubuta ci gaba don wannan sakin layi - A watan Agusta 1939 Nazi-Jamus da Tarayyar Soviet sun rattaba hannu kan Yarjejeniyar Molotov<unk>Ribbentrop, inda aka ba Finland da jihohin Baltic ga "yanayin tasiri" na Soviet. Bayan mamayewar Poland, Tarayyar Soviet ta aika da umarni ga ƙasashen Baltic, inda ta bukaci sansanonin soja a ƙasarsu. Kasashen Baltic sun yarda da bukatun Soviet, kuma sun rasa 'yancin kansu a lokacin rani na 1940. A watan Oktoba na 1939, Tarayyar Soviet ta aika da irin wannan buƙata ga Finland, amma Finns sun ƙi ba da kowane yanki na ƙasa ko sansanonin soja don amfani da Red Army. Wannan ya sa Tarayyar Soviet ta fara mamaye sojojin Finland
a ranar 30 ga Nuwamba 1939. Shugabannin Soviet sun yi hasashen cewa za a ci Finland a cikin makonni biyu. Duk da haka, duk da cewa Red Army yana da babban rinjaye a cikin maza, tankuna, bindigogi da jiragen sama, Finns sun iya kare kasarsu na kimanin watanni 3.5 kuma har yanzu sun guje wa mamayewa cikin nasara. Yaƙin hunturu ya ƙare a ranar 13 ga Maris, 1940 tare da yarjejeniyar zaman lafiya ta Moscow, wanda Finland ta rasa Karelian Isthmus ga Tarayyar Soviet. Yakin hunturu ya kasance babbar asara ga Tarayyar Soviet, kuma an fitar da ita daga League of Nations saboda harin da ba bisa ka'ida ba. Finland ta sami kyakkyawar niyya ta duniya da taimakon kayan aiki daga ƙasashe da yawa a lokacin yaƙin.