professor of diplomacy in international relations at the harvard kennedy of government and now the dean of fletcher school of law and diplomacy, admiral james tsvarides, analyst for nbc news and msnbc. admiral, let me start with you. is there any benefit to the united states and the president taunting kim jong-un about the size of his nuclear button? not in my view. it just pours fuel on a smoldering fire, katty. what we ought to be focusing on is not that nonsensical tweet but this tiny sliver of an opening diplomatically. i don t think we should completely discount it, that the north koreans and the south koreans are evidently marching toward a little bit of a seance