Relationship of international law and municipal law — Treaties — Interpretation — Enforceability — Treaty on the Non-Proliferation of Nuclear Weapons, 1968 — Article VI of Treaty — United States Constitution — Supremacy Clause of Constitution — State Party seeking to enforce its treaty rights in domestic court of another State Party — Enforceability of treaty provisions in United States’ courts — Separation of powers — Diplomatic negotiations — Decision-making with respect to nuclear disarmament — Whether falling to Executive or Judiciary — Enforceability of Article VI — Self-execution — Standing and redressability — Political question doctrine — Whether United States’ federal court able to grant plaintiff judicial relief

Treaties — Interpretation — Self-executing and non-self-executing treaties — Treaty on the Non-Proliferation of Nuclear Weapons, 1968 — Article VI of Treaty — Whether non-self-executing — Enforceability — Whether Article VI enforceable in domestic courts — Treaty text — Context — Aids to interpretation — Negotiation and drafting history — Post-ratification understanding of signatory nations — Whether Article VI providing basis for justiciable claim — The law of the United States