No one really knows for sure, but there are a couple of good theories out there.
In the spring of 1941, Hitler controlled almost all of Europe. England was doing very poorly at the time, and could not go on the offensive. This left Hitler with 2 choices, USA or Russia. USA was still neutral at this time, and Russia had a very large army, so Hitler may have thought that the defeat of Russia would be the last major hurdle in WWII. Plus, as an incentive, Russia had a lot of oil fields, something Germany was running out of.
Hitler did invade the USSR on 22 June 1941.
Russia during the winter of 1941 and 1942.
22, June 1941
He invaded Russia 22 June 1941 .
It was Germany who declared war on Russia on June 22 1941
Hitler did invade the USSR on 22 June 1941.
To get more room for Germany
Russia. Or rather, the Soviet Union.
Russia during the winter of 1941 and 1942.
Russia .
22, June 1941
22 June, 1941
June 22nd 1941
Hitler invaded Russia in 1941 in what was known as Operation Barbarossa, but this invasion was never successful and Hitler never managed to take over Russia.
He invaded Russia 22 June 1941 .
It was Germany who declared war on Russia on June 22 1941
22 June 1941 : Hitler moves East to conquer Russia starting with Operation Barbarossa .