Answer:
Hitler invaded the Societ Union because of the following:
"The destruction of the Soviet Union by military force, the permanent elimination of the perceived Communist threat to Germany, and the seizure of prime land within Soviet borders for long-term German settlement had been core policy of the Nazi movement since the 1920s." -Holocaust Encyclopedia
"'...the ultimate aim of this Vernichtungskrieg (war of destruction) against the Soviet Union was to make a ‘Garden of Eden’ out of the newly won territories in the East.” Germany planned to colonize western parts of the Soviet Union, especially the resource-rich lands of the Ukraine, as it had colonized the Warthegau in Poland. This would involve expelling the supposedly inferior “races” of Slavs and Jews who lived there and settling ethnic Germans in their place... The war against Russia is a fundamental part of the German people’s struggle for existence. It is the old struggle of the Germans against the Slavs, the defence of European culture against the Muscovite, Asiatic deluge, the defence against Jewish Bolshevism. This struggle must aim to smash the Russia of today into rubble, and as a consequence it must be carried out with unprecedented harshness."
- Facing History (.org)
"Hitler's decision to invade Russia was the product of the convictions and illusions of the dictator's demonic psyche. Since the 1918 Armistice ending World War I, he had been convinced that Bolshevism had helped defeat Wilhelmine Germany and that the German Communist Party, which he fought as the Nazi leader, would deliver the Reich to Moscow.
Even before Hitler wrote ''Mein Kampf,'' he identified the Soviet Union as the enemy. In secret, the Nazis regarded Germany's 1939 nonaggression pact with Russia as a useful way of buying time and avoiding a two-front war. The economic benefits it brought Germany were useful, but in the eyes of Hitler and the more radical Nazi chiefs these were only a pittance compared with what could be gained by conquest. Lebensraum in the east would insure the 1,000-year Reich against economic want as well as military threat." - The New York Times
