It is possible that much of what is going on is bluster and is intended for its diplomatic and political effect rather than signalling an actual imminent attack. But its worth pointing out at this time that our Constitution was specifically written to make this kind of posturing and threatening impossible. Not only was the power to make war specifically entrusted to the lower house so that such decisions would be made by those closest to the people but military appropriations were specifically limited to two years so that the executive could not feel that he had an army at his disposal to do with as he saw fit.
The founders understood human nature and were afraid of what would happen if these guidelines were not adhered to. It appears they were dead-on.