Sailfish 1, give it up.  You are peeing into the wind.  The chronology of diplomatic efforts to stop or rein in North Korea’s nuclear and missile ambitions summarized in the website previously cited runs from 1985 to March 2017.  It is not ancient history.    Moreover, you cannot redefine terms to support your comment.  High-level diplomacy typically is conducted by Ambassadors, Secretaries of State, Assistant and Deputy Secretaries of State or people appointed by the President as his personal envoy or representative.  Heads of state may talk with other heads of states and agree in principle on various issues, but the nuts and bolts of establishing binding agreements or treaties is done by high-level diplomats mentioned above.