State immunity — Immunity from jurisdiction — Dispute over property rights — Building used as diplomatic mission by foreign State — Application by another foreign State aimed at obtaining recognition of property rights over building — Whether municipal courts may invoke immunity ex officio on behalf of foreign State — Whether municipal courts required to determine whether foreign State is likely to assert immunity in subsequent proceedings

Diplomatic relations — Immunity — Inviolability of premises of diplomatic mission — Vienna Convention on Diplomatic Relations, 1961, Articles 22 and 31 — Scope of application — The law of France