Jurisdiction — Admissibility — Same dispute submitted to state court and to another arbitral tribunal — Same remedies sought in different fora — Whether an abuse of process

International investment law — Obligation not to expropriate unlawfully — Obligation of treatment in accordance with general principles of international law — Prohibition against arbitrary and discriminatory measures — Obligation to provide fair and equitable treatment — Obligation to provide full protection and security — Interpretation and application

Costs — Article 38 of UNCITRAL Rules — Apportionment of costs between the parties — Reasonable apportionment — Circumstances of case