International law in general — Relation to municipal law — Treaties and international agreements — Consular Convention between United States and U.S.S.R., 1968 — Whether Treaty exemption of diplomatic premises from taxation prevails over inchoate tax lien in existence before Treaty took effect — Rights created by treaty as part of law of each state — The law of the United States

States as international persons — In general — Sovereignty and independence — Conduct of foreign relations — Conclusiveness of statements of the Exclusive — Consular Convention between United States and U.S.S.R., 1968 — Treaty exemption of diplomatic premises from taxation — Whether Federal Government in exercise of its responsibility for conduct of foreign affairs has locus standi to prevent local government action which would violate United States treaty obligation — Statement by Department of State concerning status of property — The law of the United States

Treaties — Conclusion and operation — Entry into force — 1968 Consular Convention between United States and U.S.S.R. — Whether treaty exemption of diplomatic premises from taxation — Effect in municipal law — The law of the United States

Diplomatic and consular intercourse and privileges — Permanent diplomatic envoys — Privileges and immunities — Diplomatic premises — Immunity from local taxation of property occupied by Permanent Representative of U.S.S.R. to United Nations — 1968 Consular Convention between United States and U.S.S.R. — The law of the United States