Claims — Order for surrender of property held by foreign State — Failure to comply with court order — Inherent contempt power of United States federal courts — Civil contempt sanctions — Non-compliance with order to be demonstrated with reasonable certainty to warrant contempt sanctions

State immunity — Sanctions — Whether foreign State immune from civil sanctions for contempt of court — Whether issue comparable to immunity from jurisdiction or immunity from execution — Foreign State declining to take part in proceedings following dismissal of jurisdictional objection — Judgment in default — Foreign State failing to comply with judgment in default

Relationship of international law and municipal law — United States domestic law — Foreign Sovereign Immunities Act 1976 — Courts’ deference to alleged risks to foreign policy interests — When appropriate — The law of the United States