Treaties
How international agreements are made, interpreted, and enforced — the backbone of international law.
The Treaty Lifecycle
The 1969 Vienna Convention on the Law of Treaties (VCLT) — often called the 'treaty on treaties' — governs how treaties work:
Negotiation: States (or their representatives) negotiate the text. Major multilateral treaties can take years of negotiation.
Signature: Signing indicates a state's intent to be bound, but usually does not create legal obligations on its own. It does create an obligation not to 'defeat the object and purpose' of the treaty.
Ratification: This is the formal act by which a state consents to be bound. In many countries, ratification requires legislative approval.
Entry into force: Most treaties specify a minimum number of ratifications before they take effect. The Rome Statute needed 60 ratifications; it received them in 2002.
Reservations: States can make reservations — unilateral statements that modify or exclude certain treaty provisions — unless the treaty prohibits them or they are incompatible with the treaty's object and purpose.