维也纳条约法公约（英文版）SIGNED AT VIENNA 23 May 1969ENTRY INTO FORCE: 27 January 1980The States Parties to the present ConventionConsidering the fundamental role of treaties in the history ofinternational relations,Recognizing the ever-increasing importance of treaties as a source ofinternational law and as a means of developing peaceful co-operation amongnations, whatever their constitutional and social systems,Noting that the principles of free consent and of good faith and the pactasunt
