Diplomatic relations — Immunity — Diplomatic agent — Immunity from civil jurisdiction — Vienna Convention on Diplomatic Relations, 1961 — Article 31(1)(a) — Whether declaratory of customary international law — Exceptions to immunity — Real action relating to private immovable property situated in the territory of the receiving State — Whether including claims for vacation of apartment required for personal use

Treaties — Principles of interpretation — Vienna Convention on the Law of Treaties, 1969 — Articles 31 and 32 — Restrictive interpretation — Interpretation in accordance with rule of customary international law — Vienna Convention on Diplomatic Relations, 1961, Article 31(1)(a) — The law of Italy