Byelorussia in World War II – Wikipedia

Byelorussia (also known as the Byelorussian Soviet Socialist Republic), known today as Belarus, was a republic of the Soviet Union when World War II began. The borders of Belarus were greatly expanded in the invasion of Poland of 1939 and finalised after World War II. Following the German military disasters at Stalingrad and Kursk, a collaborationist Belorussian self-government (BCR) was …

https://en.wikipedia.org/wiki/Belarus_in_World_War_II