I have to agree with IsraelForever and others that stated Iran is the biggest threat. Iran is run by a maniacal, self-professed Jew hating, unpredictable napoleon-complexed psycho; and this is the worst and most dangerous type of individual. He believes what he says, he encourages his followers to do the same, and he knows no boundaries. In all of history, this type of leader has proved to be a dangerous combination.