Japan would not quit. Invasion was required as a follow up to a fire bombing and destruction that would have exceeded all previous campaigns. Russia wanted a piece of Korea, Japan, and all of southeast asia but had to quickly mobilize and get of of the treaty they had with Japan. Truman saw that Russia was the greater threat to world peace and agreed with Churchill. Stalin got in a meaningless battle that gave him dibs on Southeast Asia and give ammunition to the critics of Truman. I personally think that if killing a million Japs saves American lives we were right. Now we have to equate bushido with the Emporer and Muhammed.
Gunmen in Egypt kill guard outside Niger embassy (Reuters)
from the article: The chief of staff threatens