Respuesta :
Answer:
After first having cooperated with Germany in invading Poland whilst remaining neutral in the Allied-Axis conflict, the Soviet Union perforce joined the Allies in June 1941 after being invaded by Germany.
Explanation:
(Wikipedia)
Answer:
Germany broke the German-Soviet Nonagression Pact.
Explanation:
This event led to the Soviet Union joining the side of the Allies during World War II
