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ARTICLE-28: Non-retroactivity of treaties     [go to this ARTICLE]
... Unless a different intention appears from the treaty or is otherwise established, its provisions do not bind a party in relation to any act or fact which took place or any situation which ceased to exist before the date of the entry into force of the treaty with respect to that party. ...


ARTICLE-48: Error     [go to this ARTICLE]
... 1. A State may invoke an error in a treaty as invalidating its consent to be bound by the treaty if the error relates to a fact or situation which was assumed by that State to exist at the time when the treaty was concluded and formed an essential basis of its consent to be bound by the treaty. ...


ARTICLE-62: Fundamental change of circumstances     [go to this ARTICLE]
... 1. A fundamental change of circumstances which has occurred with regard to those existing at the time of the conclusion of a treaty, and which was not foreseen by the parties, may not be invoked as a ground for terminating or withdrawing from the treaty unless: ...


ARTICLE-64: Emergence of a new peremptory norm of general international law (jus cogens)     [go to this ARTICLE]
... If a new peremptory norm of general international law emerges, any existing treaty which is in conflict with that norm becomes void and terminates. ...


ARTICLE-69: Consequences of the invalidity of a treaty     [go to this ARTICLE]
... (a) each party may require any other party to establish as far as possible in their mutual relations the position that would have existed if the acts had not been performed; ...