Whakaotihia te rerenga e whai ake nei: I tīmata te hītori hōia o te Soviet Union i ngā rā whai muri i te 1917 October Revolution i kawea mai ai ngā Bolsheviks ki te mana. I te tau 1918 i hangaia e te kawanatanga hou te ope taua Whero, na reira i hinga ai ona hoa whawhai o roto i te Pakanga Taiao o Ruhia o te tau 1917-1922. I nga tau 1918-1921 i hinga te ope Whero i te Pakanga Polish-Soviet (1919-21) me nga pakanga motuhake mo Estonia (1918-20), Latvia (1918-20) me Lithuania (1918-19). Ko te ope Whero
I whakaekehia a Finland (Noema 1939); i whawhai i nga Pakanga o Khalkhin Gol o Mei ki te Mahuru 1939 (me tana hoa a Mongolia) ki a Japan me tana kawanatanga a Manchukuo; i tohaina i te wa i uru ai te Soviet Union, i te whakaaetanga me te Tiamana Nazi, ki te whakaekenga o Poland i te Mahuru 1939, ka noho ki nga Baltic States (Hune 1940), Bessarabia (Hune-Hōngongoi 1940) me Northern Bukovina (Hune-Hōngongoi 1940) (mai i Romania). I te Pakanga Tuarua o te Ao, ka noho te ope Whero hei kaha nui ki te patu i a Tiamana Nazi me te wikitoria i a Manchuria. Whai muri i te pakanga, ka nohoia e ia a Tiamana ki te Rāwhiti me nga whenua maha i waenganui me te rawhiti o Uropi, i noho hei whenua takitahi i roto i te Soviet bloc.