The obligation of a state to perform under a treaty, after a substantial change of circumstances
has occurred, is a question which has provided material for generations of international …

… practice and jurisprudence with regard to the law of treaties. Due to the sheer length of the
Convention and the amount of relevant material on the law of treaties, this volume is the result …

… (‘VCLT’) does not occupy the whole ground of the law of treaties, it covers the most … point
for any description of the law. For good reason, the VCLT has been called the treaty on treaties. …

… The Vienna Convention on the Law of Treaties was opened … of the United Nations Conference
on the Law of Treaties which met … The Convention entered into force on 27 January 1980, …

… The United Nations Conference on the Law of Treaties was the last great codification
conference that successfully used voting as its working method and could adopt the draft articles by …

… international law and practice, although, even here, some qualification may be necessary,
for example, with respect to reservations, where the state of the pre-Convention law was …

… treaties according to internationally authoritative canons rather than fashion their own common
law treaty … common law treaty canons differ from the Vienna Convention's internationalist …

… to adopt the treaty form rather than that of a code.The draft, completed by 1966, became
the basis of arduous negotiations at the United Nations Conference on the Law of Treaties …

… United Nations. They pointed to the fact that even the most general of all multilateral treaties,
the United Nations … parties negotiating the treaty, rather than for the treaties Convention, to …

… It is now generally recognised, at least in the interpretation of constitutional documents and
in particular of the United Nations Charter, that the objects and purposes of a treaty may have …