State immunity — Attachment and execution — Embassy bank account — Judgment creditor seeking to levy execution against foreign State by attachment of bank account — Statement by foreign State that funds in bank account used to defray embassy expenses — Whether bank account liable to attachment — Conclusiveness of statement by foreign State

Relationship of international law and municipal law — Customary international law — Application by municipal courts — Practice and opinions of the Executive concerning customary international law — Whether binding on municipal courts

Diplomatic relations — Immunity — Embassy bank account — Account in use for defraying running expenses of embassy — Whether subject to execution in receiving State — The law of the Netherlands