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Nazi Germany invaded the Soviet Union in 1941. It was called Operation Barbarossa. This was Germany's attempt to cripple the Soviet Union, and take control. As for the Soviet war effort they didn't want involvement. They'd signed a non-aggression pact with Germany. <span />
The wealth that is produced by selling the oil are creating powerful elites and also a big gap between the rich and the poor and this best describes a challenge in the Middle East resulting from oil production. A category of people in the Middle East are living a lavish life, while others are struggling to get their daily bread.