Why did the Russians back out in both world wars?

Answer 1

The Russians backed out of World War I due to the Bolshevik Revolution, which created the Union of Soviet Socialist Republics.

Russia did NOT back out of World War II. Russia had a non-aggression pact/trade agreements with Germany until the German Army launched Operation Barbarossa, breaking the treaty and invading Russia. The Russian Army held the Germans at Leningrad and Stalingrad, eventually defeating the Germans at Stalingrad while taking 300,000 Germans prisoner. From there, the Russians pushed the German army back to Berlin, capturing the Reichstag, or the German equivalent of the US capital building. In fact, the Russian army was responsible for defeating around 65% of all German forces, while Russia recieved 6 million casualties.