IMHO a major factor in the decision to use the Bomb in Hiroshima & Nagasaki was formal payback for Pearl Harbor, a message which Moscow and Beijing seem to have received loud and clear hence the Cold and not Hot War with them... (Vietnam/Korea aside, of course)
America's response to attack?
Attack US and we'll f**k you up real good...
Have you seen the info and links posted to this thread? Extensive damning evidence of Iraq/Al Queda link.