Artikel 20

1. If a dispute arises between two or more Parties about the interpretation or application of this Protocol, they shall seek a solution by negotiation or by any other means of dispute settlement acceptable to the parties to the dispute.
2. When signing, ratifying, accepting, approving or acceding to this Protocol, or at any time thereafter, a Party may declare in writing to the Depositary that for a dispute not resolved in accordance with paragraph 1 of this article, it accepts one of the following means of dispute settlement as compulsory in relation to any Party accepting the same obligation:
a) Where the Parties are Parties to the Convention, and have accepted as compulsory in relation to each other one or both of the means of dispute settlement provided in the Convention, the settlement of the dispute in accordance with the provisions of the Convention for the settlement of disputes arising in connection with the Convention;
b) In any other case, the submission of the dispute to the International Court of Justice, unless the Parties agree to arbitration or some other form of dispute resolution.