State immunity — Attachment and execution — Property of foreign State used as residence for diplomatic staff — Whether property immune from execution — Decision turning on whether use of property constituting commercial activity — Determination by Executive that property being used for sovereign purposes — Significance — United States Foreign Sovereign Immunities Act 1976

Relationship of international law and municipal law — Conduct of foreign relations — United States — Recognition of States and governments — Power vested in Executive — Scope — Whether limited to act of recognition — Whether including power to enter into ancillary Executive Agreement concerning diplomatic rights and privileges — United States Diplomatic Relations Act 1978

Diplomatic relations — Immunity — Property utilized as residence for diplomatic staff — Whether subject to execution in receiving State — The law of the United States