In 1939 the Western powers were shocked to see a treaty between these two countries:

Name: In 1939 the Western powers were shocked to see a treaty between these two countries:
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The Molotov-Ribbentrop Pact signed between Germany and the Soviet Union in 1939 was a shock to the Western powers as they had assumed that the Soviet Union would be an ally in any potential conflict with Germany. This treaty included secret protocols dividing up parts of Eastern Europe between the two countries.

In 1939 the Western Powers Were Shocked to See a Treaty