Nazi Germany and Soviet Russia
Soviet Russia always suspected that the capitalist countries of Western Europe were siding with the Fascist forces to undermine Russia. Still, realizing the rising threat from Nazi Germany, Britain and France started negotiations with Soviet Russia for an alliance with Germany. But, the talks broke down. Soviet Union was now looking for some sort of strategic protection. So, on 23rd August 1939, Germany and the Soviet Union signed a non-aggression pact. Under this pact, both were not supposed to attack one another. On 1st September, Germany invaded Poland and started WWII. So, option ‘a’ is the correct answer.
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