PART IU

OBSERV ANCE, APPLICATION AND INTERPRETATION OF TREATIES

SECTION 1. OBSERV ANCE OF TREATIES

Article 26

Pacta sunt servanda

Every treaty in force is binding upon the parties to it and must be performed by them in

good faith.

Article 27

Internai law of States, rufes of international organizations and observance of treaties

1. .A State party to a treaty may not invoke the provisions of its internai law as

justification for its faílure to perform the treaty.

2. An international organization party to a treaty may not invoke the roles of the

organization as justification for its failure to perform the treaty.

3. The roles contained in the preceding paragraphs are without prejudice to article 46.

SECTION 2. APPLICATION OF TREATIES

Article 28

Non-retroactivity of treaties

Unless a different intention appears from the treaty or is otherwise establíshed, íts

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 29

Territorial scope of treaties

Unless a different intention appears from the treaty or is otherwise established, a treaty

between one or more States and one or more intemational organizations is binding upon

each State party in respect of its entire territory.

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