Kammala jumla mai zuwa: A cikin 1939, Tarayyar Soviet ta yi ƙoƙari ta mamaye Finland, bayan haka bangarorin suka shiga yarjejeniyar zaman lafiya ta ba Tarayyar Soviet yankin gabashin Karelia (10% na yankin Finnish), kuma an kafa Jamhuriyar Socialist ta Karelo-Finnish ta hanyar haɗuwa da yankunan da aka ba su tare da KASSR. Bayan Yuni 1940 Soviet Ultimatum da ke buƙatar Bessarabia, Bukovina, da yankin Hertza daga Romania, Soviets sun shiga waɗannan yankuna, Romania ta ba da izini ga bukatun Soviet da kuma
Soviets sun mamaye yankuna.