Diplomatic relations — Immunity — Diplomats — Military attaché — Action to recover arrears of rent in respect of military attaché's residence — Whether attaché immune from jurisdiction of courts — Vienna Convention on Diplomatic Relations, 1961, Article 31(1) and (3) — Whether declaratory of customary international law

Relationship of international law and municipal law — Treaties — Whether provisions of Vienna Convention on Diplomatic Relations, 1961, incompatible with Italian Constitution — Primacy of constitutional principles over rules of customary international law

Treaties — Effect in municipal law — Constitutional limitations — The law of Italy