War — In general — Treaties of peace — Performance of — Treaty of Peace with Japan, 1951 — Netherlands-Japanese Property Commission — Competence of — “Property in Japan of an Allied Power” (Peace Treaty, Article 15 (a)) — Captured Netherlands ship sunk outside territorial waters of Japan after cessation of hostilities — Offer by Japanese Government to compensate by returning vessel of same type — Effect on offer of waiver of reparations claims in Peace Treaty.