Article 71 Vienna Convention on the Law of Treaties

Consequences of the invalidity of a treaty which conflicts with a peremptory norm of general international law

1. In the case of a treaty which is void under article 53 the parties shall:

(a) eliminate as far as possible the consequences of any act performed in reliance on any provision which conflicts with the peremptory norm of general international law; and

(b) bring their mutual relations into conformity with the peremptory norm of general international
law.

2. In the case of a treaty which becomes void and terminates under article 64, the termination of the treaty:

(a) releases the parties from any obligation further to perform the treaty;

(b) does not affect any right, obligation or legal situation of the parties created through the execution of the treaty prior to its termination, provided that those rights, obligations or situations may thereafter be maintained only to the extent that their maintenance is not in itself in conflict with the new
peremptory norm of general international law.

See also: Article 70 Vienna Convention on the Law of Treaties