Interpretation of Treaties — Treaties and Limitations of Sovereignty — The Preamble — Meaning of “Embargo” — Contemporaneous Interpretation — Use of Dictionaries — Reference to Other Treaties — Bilingual Treaties — Limits of the Duty of Non-Interference with Ships and with the Freedom of Commercial Transactions — Restrictive Interpretation of Treaty Provisions of an Exceptional Nature — Necessity of an Actual Decision as a Basis for a Claim for Compensation — Insufficiency of Oral Ruling — Conditions of a Valid Renunciation of Rights — The Law Applicable — Treaties as Exclusive Sources of Arbitral Decision.