Article 15

Consent to be bound by a treaty expressed by accession

The consent of a State or of an intemational organization to be bound by a treaty is

expressed by accession when:

a) the treaty provides that such consent may be expressed by that State or that

organization by means of accession;

b) it is otherwise established that the negotiating States and negotiating

organizations or, as the case may be, the negotiating organizations were

agreed that such consent may be expressed by that State or that organization

by means of accession; or

e) all the parties have subsequently agreed that such consent may be expressed

by that State or that organization by means of accession.

Article 16

Exchange or deposit of instruments of ratification, formal conjirmation, acceptance,

approval or accession

1. Unless the treaty otherwise provides, instruments of ratification, instruments relating

to an act of formal confirmation or instruments of acceptance, approval or accession

establish the consent of a State or of an intemational organization to be bound by a

treaty between one or more States and one or more intemational organizations upon:

a) their exchange between the contracting States and contracting organizations;

b) their deposit with the depositary; or

e) their notification to the contracting States and to the contracting

organizations or to the depositary, if so agreed.

2. Unless the treaty otherwise provides, instruments relating to an act of formal

con:firmation or instruments of acceptance, approval or accession establish the

consent of an intemational organization to be bound by a treaty between intemational

organizations upon:

a) their exchange between the contracting organizations;

b) their deposit with the depositary; or

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