The WW2 nuclear bombings of Hiroshima and Nagasaki predate any real nuclear doctrine. I don't think they are particularly informative of nuclear doctrine today.

The WW2 nuclear bombings of Hiroshima and Nagasaki predate any real nuclear doctrine. I don't think they are particularly informative of nuclear doctrine today. And yes, as the other poster says, Japanese invasion of the continental US is an absurdly unrealistic proposition - even if Japan had achieved all of its wartime objectives.