Following the Nazi-Soviet Invasion of Poland in 1939, the Polish anti-German resistance movement Armia Krajowa was actively operating on the territory of modern Belarus, although many ethnic Belarusians also actively participated in the movement [REF].
Towards the end of World War II in Europe, at the insistence of Joseph Stalin during the Tehran Conference of 1943, West Belarus was formally ceded by the Allies to the Belorussian SSR [REF].