It is set forth in Article 2, paragraph 2, of the Charter of the United Nations; it is also embodied in Article 26 of the Vienna Convention on the Law of Treaties of 23 May 1969.
《联合国宪章》第二条第二款已对此作出规定。 1969年5月23日的《维也纳条约法公约》第二十六条也体现了这项原则。