Joining the Biological Weapons Convention
A state can become a State Party to the Biological Weapons Convention through two means: ratification and accession. Ratification is for states that have already signed the Convention, known as signatories. Accession is for states that have not signed the Convention. Since the Convention entered into force in 1975, it is no longer possible to sign it but only to accede to it.
The domestic process for ratification or accession depends on the constitutional arrangements of the state concerned, but often the national parliament must formally approve. Once the domestic requirements have been satisfied, an instrument of accession or ratification should be deposited with one or more of the three Depositary Goverments of the Convention: the Russian Federation, the United Kingdom, and the United States. When it is received, the state concerned then becomes a State Party to the Convention.