Actually, I've done some study on that. If I remember correctly, Japan DID attempt to issues a warning, or at least make a formal declaration of war shortly before the deed. Unfortunately, a diplomatic SNAFU delayed the formal declaration.
I wish I could remember were I read this, but, (again based upon an unnammed source I read MANY years ago), Japan had preparred another wave of strikes once they had refueled their plains, but becaused of the SNAFU, they pulled back as it was against their honour to have attacked in such a manor
I could be wrong.... and either way, I don't think that those threatening use of a dirty bomb have near the honour of Japan.
Some of you people need a life. Regarding the immediate posts when new information is released.
We all have the same sources!!
Two points:
The Japanese did send a Declaration of War for the Japanese ambassador to deliver to the White House an hour before the attack, but there were only two people cleared for decoding the encrypted cable, and neither one was a typist. They delivered the cable late.
The Japanese Navy did not send the follow-up attack on the Navy fuel depot and maintenance facilities because the American aircraft carriers were not it port, and Admiral Yamamoto decided not to risk his fleet being found by the enemy carriers.
Yeah, some honor. Nanking, ring any bells? The Death Marches -- in the Phillipines and elsewhere? The unspeakable treatment of US prisoners?