As far as regimes killing people, the Germans were pikers compared to the Soviet Union which included both Russia and Ukraine. There are others including the Khmer Rouge and regimes in Africa which likely deserve honorable mention. But let's not forget the current Communist Chinese regime who in the 20th century likely killed more people than all other regimes on earth combined at least during that time period.
The thing that many here do not seem to understand is that true globalists secretly celebrate high body counts regardless of whether it is from inhumane regimes, war, lack of shelter, famine or disease. Prince Philip said that after he died, he hoped to come back as a deadly virus. He wrote the first version of this in a forward to a book from 1986 but was quoted in a magazine article saying the same thing two years later. Other globalists have been quoted saying that they would like to see the world's human population reduced to less than a billion as quickly as possible.
These people have a lot of money and think that they are much brighter and more worthy than the rest of us. Bill Gates is one of the best examples. He wants to spray fine particulate into the upper atmosphere to cool the earth. Other than a huge pile of assets there is little evidence to suggest that Bill is even in the top 1% of gifted brainiacs in the world. He might not even be as smart as the court jester, Bill Nill Nye the Science Guy.
In WW2 alone, the Russians lost an estimated 30 to 40 million people..if not more. Nobody really knows for sure.
At that time, “THE” Ukraine was part of Russia so they get to be included in that number.
After the Surrender, the war went on in Poland. They continued the murder there.
BUT, the Ukrainian massacre of Poles, Jews and other ethnic groups during that war was particularly barbarous. As Barbarous as the German death squads let loose in Belarus and other regions.