The international community's credibility is on the line. And America's and Congress'[s] credibility is on the line because we give lip service to the notion that these international norms are important ...
Barack Obama put his own credibility, and no one else's (except perhaps that of his subordinates in the administration who are expected to parrot him) on the line when he started flapping his gums about "red lines" and so forth.
He knew, or should have known, damn well (being a former "constitutional law professor") that the power to declare war is vested in Congress, not the president.
He forged the check. Now he's trying to embarrass the real account holders into not stopping payment on it.