Artikel 34

1. Any dispute which might arise between two or more Contracting States concerning the interpretation or application of the present Convention shall be submitted to the International Court of Justice on the application of one of the parties to the dispute or by special agreement unless the parties agree on a different method of peaceful settlement of the dispute.
2. However, proceedings may not be instituted before the International Court of Justice which relate to:
(a) a dispute concerning a question arising in proceedings instituted against a Contracting State before a court of another Contracting State, before the court has given a judgment which fulfils the condition provided for in paragraph 1 (b) of Article 20;
(b) a dispute concerning a question arising in proceedings instituted before a court of a Contracting State in accordance with paragraph 1 of Article 21, before the court has rendered a final decision in such proceedings.