International organizations — Personality — Concept of international legal personality — Organization's legal status not dependent upon law of State in which it has its seat — Limited nature of personality — Whether member States of organization liable for obligations incurred by organization — Constituent instruments of organization — Inference to be drawn from silence of constituent instruments regarding liability of members — Arbitration clause in contract concluded by organization — Whether binding upon member States

State immunity — Jurisdictional immunity — Arbitration proceedings — Proceedings instituted against member State in respect of obligations of international organization — Whether State immune — Whether constitution of organization amounting to waiver of immunity

Arbitration — Procedure — Arbitration proceedings against different parties — Whether permissible — Whether parties can be required to defend proceedings en consorité — Proceedings against States, international organization and company