It's the standard way A-rabs negotiate and especially Iran. Where Kerry is concerned he's alight weight judging by his remarks. Their system is waste time with inanities and small talk, keep delaying and when they finally do make some concession ignore it before the ink is dry on the Hail Kerry headlines in the NY Times. then go on a bout their business which has not ceased nor faltered in the last twenty or so years except when Israel bombed the shit out of their facilities. For them the only dead line is when they get to nuke somebody.