1. This Convention and any Protocol shall be open for accession by States and by regional economic integration organizations from the date on which the Convention or the Protocol concerned is closed for signature. The instruments of accession shall be deposited with the Depositary.
2. In their instruments of accession, the organizations referred to in paragraph 1 shall declare the extent of their competence with respect to the matters governed by the Convention or the relevant Protocol. These organizations shall also inform the Depositary of any relevant modification in the extent of their competence.
3. The provisions of Article 34 (2) shall apply to regional economic integration organizations which accede to this Convention or any Protocol.