Article 28 Vienna Convention on the Law of Treaties Non-retroactivity of treaties 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…

Article 27 Vienna Convention on the Law of Treaties Internal law and observance of treaties A party may not invoke the provisions of its internal law as justification for its failure to perform a treaty. This rule is without prejudice to article 46. See also: Article 26 lVienna Convention on the Law of Treaties

Article 26 Vienna Convention on the Law of Treaties “Pacta sunt servanda” Every treaty in force is binding upon the parties to it and must be performed by them in good faith. See also: Article 25 Vienna Convention on the Law of Treaties

Article 25 Vienna Convention on the Law of Treaties Provisional application See also: Article 24 Vienna Convention on the Law of Treaties

Article 24 Vienna Convention on the Law of Treaties Entry into force See also: Article 23 Vienna Convention on the Law of Treaties

Article 23 Vienna Convention on the Law of Treaties Procedure regarding reservations See also: Article 22 Vienna Convention on the Law of Treaties

Article 22 Vienna Convention on the Law of Treaties Withdrawal of reservations and of objections to reservations (a) the withdrawal of a reservation becomes operative in relation to another contracting State only when notice of it has been received by that State; (b) the withdrawal of an objection to a reservation becomes operative only when…

Article 21 Vienna Convention on the Law of Treaties Legal effects of reservations and of objections to reservations See also: Article 20 Vienna Convention on the Law of Treaties

Article 20 Vienna Convention on the Law of Treaties Acceptance of and objection to reservations (a) acceptance by another contracting State of a reservation constitutes the reserving State a party tothe treaty in relation to that other State if or when the treaty is in force for those States;(b) an objection by another contracting State…

Article 19 Vienna Convention on the Law of Treaties Formulation of reservations A State may, when signing, ratifying, accepting, approving or acceding to a treaty, formulate areservation unless: (a) the reservation is prohibited by the treaty; (b) the treaty provides that only specified reservations, which do not include the reservation in question, may be made;…