What was one of the most surprising diplomatic partnerships of the 1930s?

Question

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The Molotov-Ribbentrop Agreement, also known as the Nazi-Soviet Pact, was surprising because it was a non-aggression pact between two ideologically opposed regimes: Nazi Germany and the Soviet Union. This agreement, signed in 1939, allowed both powers to avoid a two-front war and partition Eastern Europe into spheres of influence, shocking many given the stark ideological differences between communism and fascism.

What Was One of the Most Surprising Diplomatic Partnerships of the 1930s