Answer:Soviet Union 23,400,000 casualties!
Step-by-step explanation:
What is so shocking about the Soviet Union’s deaths is that most of the 23 million casualties was caused by a single man – Joseph Stalin. The vicious leader killed many more people than Adolf Hitler, and is in fact, known as the biggest killer in history. It is estimated that he caused the death of 43 million people, although many of the deaths did not come during World War II. The rest of the death toll can be accounted for as Soviet Union soldiers who died in the terrible battles against Germany. The infamous Battle of Stalingrad alone killed almost 2 million people.