Claims — State control over private claims — Discretion of State regarding espousal of claims by nationals — Claims regarding taking of land — Agreement between States that each would be responsible for compensating its own nationals for past acts of expropriation by the other State — Acknowledgment of claim by defendant State — Whether giving rise to claims by nationals against their own State — Whether such claims constitute interests in immovable property — Whether State entitled to immunity before courts of foreign State

State immunity — Jurisdictional immunity — Immovable property — United States Foreign Sovereign Immunities Act 1976 — Extent of exception regarding immovable property — Torts allegedly committed by foreign State — Requirement of connection between tort and forum State — The law of the United States