Vienna Convention on the Law of Treaties

This convention applies to treaties between state.

Expression of Consent to be Bound

Adoption of the Text

Authentication

Obligation not to defeat the purpose and object of the treaty.

Formulation of Reservations

Acceptance and Objection to Reservations.

Pacta Sunta Servanda

Conflicting internal law is not justification for violating treaty

Golden Rule of Interpretation - Ordinary meaning of words in context of and in light of the treaty's object and purpose

Supplementary means of interpretation

Interpretation of treaties authenticated in two or more languages.

Error

Corruption of a representative of a State

Fraud

Coercion of a representative of a State

Coercion of a State by the threat or use of force

Treaties conflicting with peremptory norm of general international law.

Termination or suspension of a treaty as Consequence of its Breach.

Fundamental Change of Circumstances