The conversation between human and AI assistant.
[|Human|] From the passage provided, extract the number of casualties by nation during World War II
[|AI|] USSR - 26.6 million
Poland - 5.8 million
Germany - 5.3 million
China - 20 million
Japan - 3.1 million
[|Human|] 
From the passage provided, extract the number of casualties by nation during World War II