A. It violated the pact between the two countries, leading the Soviet Union to join the Allied Powers
Explanation:
On August 23, 1939, the Soviet Union and Nazi Germany signed a non-aggression treaty, usually known as the Ribbentrop-Molotov Pact named after the foreign affairs ministers of both countries that signed the treaty. The effects of the treaty were diminishing with the increasing hostility between both nations until 1941 when the Nazi regime decided to invade the Soviet Union. Germany, led by Adolf Hitler, decided to do this to get access to the oil and gas resources located in the Caspian Sea and the Black Sea, which were so necessary for the Nazi military machine. For this reason, since Germany broke the Treaty conditions, the Soviet Union joined the Allied Powers (the US, the UK, and France) to defeat Nazi Germany.
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