Ukrainian liberation movement (1920–1950)
The Ukrainian Liberation Movement (1920–1950) was an armed and political struggle to re-establish an independent Ukrainian state following the defeat of Ukrainian statehood in the Ukrainian War of Independence. It opposed the partition of modern Ukraine among the Soviet Union, Second Polish Republic, Czechoslovakia, and Romania.
Source: Wikipedia — Ukrainian liberation movement (1920–1950) (CC BY-SA 4.0)