Why didn't Hitler win Russia in one fell swoop during World War II?

Hitler really wanted to win Russia in one fell swoop, but he couldn't. I think that's all:

1. At that time, the Soviet Union was too big. The German Blitzkrieg encountered a broad strategic leap of the Soviet Union and was regarded as an opponent. Its own supply line was too long, which led to the failure of supply!

2. In the Soviet Union, there was strong resistance, such as the famous Battle of Stalingrad, the Battle of Leningrad and the Battle of Moscow. In the face of the Soviet Union, the Germans did not give up brick by brick, and lost a large number of elite divisions in street fighting!

After the October Revolution, the Soviet Union vigorously developed industry, especially heavy industry. Although it paid a great price, with the strong support of the United States, most weapons such as planes, tanks and artillery in the Great Patriotic War, even the famous Katyusha, can be manufactured, so the Soviet Union is not inferior to the Germans in weapons and equipment.

Germans can't make a quick decision in the Soviet Union. After winter, the extremely cold weather made their planes and tanks lie in their nests. Coupled with the defects of logistics supply, the Germans have a large number of non-combat attrition, which has greatly affected the German offensive, and even has no offensive power!

Nevertheless, the Soviet-German war lasted for more than three years, and both sides suffered heavy losses, especially in the Soviet Union, with casualties even exceeding 40 million. This war is really tragic. The German army is an aggressor and unjust. After World War I, Germany suffered a lot, and the war initiated by Germany brought a devastating blow to all mankind, but it still failed under the joint attack of the Allies.