Human rights — Right to property — Social security system — Pension system — Retirement — Obligations of State — Different treatment — Whether objective and reasonable grounds for different treatment — European Court of Human Rights — European Convention on Human Rights, 1950

Nationality — Citizens of Latvia — Non-citizens of Latvia — Ex-USSR citizens — Aliens — Stateless persons — Obligations of State — Freedom of action — USSR immigration policy

Relationship of international law and municipal law — European Court of Human Rights — Jurisprudence of Grand Chamber — Andrejeva v. Latvia finding violation of European Convention on Human Rights, 1950 — Whether distinguishable on facts — Obligations of Latvia under Convention

State succession — State continuity — Statehood — Unlawful occupation — Illegal annexation — Rights and obligations of illegally annexed State — Restoration of independence of Latvia — USSR — Bilateral agreements — The law of Latvia