The Russians suffered the most casualties because that was the largest war, they put in the most work fighting off the German invasion. All the other pussy countries surrendered. If it wasn't for Russia zee Germans win. America swoops in hella late and acts like they won the war, nah son
They were torpedoed into WWI and dive-bombed into WWII, they would have never been involved if they werent affected
But thats just politics for ya