An article in the Boston Globe tells how, possibly, it was not the Atomic Bombs that dropped on Hiroshima and Nagasaki 64 years ago, that causes the defiant Japanese to surrender but, actually, the threat of a Russian invasion that forced their surrender to the Americans. It questions the popular thought that having nuclear weapons is a deterant for war or at least a nuclear attack. Mass civilian casualities haven't and will not force any army to surrender.
Boston Globe: Why did Japan Surrender? Article.