Bayan mamayewar Poland a watan Satumbar 1939, sojojin Jamus da na Soviet sun raba yankin Poland. Ta haka, Gabashin Galicia da Volhynia tare da yawan mutanen Ukraine sun zama wani ɓangare na Ukraine. A karo na farko a tarihi, al'ummar ta haɗu.A 1940, Soviets sun haɗu da Bessarabia da arewacin Bukovina. SSR na Ukrainian sun haɗu da yankunan arewa da kudancin Bessarabia, arewacin Bukovina, da kuma yankin Hertsa. Amma ya ba da yammacin yankin Jamhuriyar Soviet ta Soviet ta Moldova zuwa sabuwar Jamhuriyar Soviet ta Moldavian. Wadannan nasarorin da aka samu na USSR sun sami karbuwa a duniya ta yarjejeniyar zaman lafiya ta Paris ta 1947. Tambaya: Yaushe aka fara haɗa al'ummar?
Shekaru na 1940