Diplomatic relations — Inviolability of diplomatic mission — Duty of receiving State to protect embassy premises — Vienna Convention on Diplomatic Relations 1961, Article 22(2) — Occupation of embassy and taking of hostages by foreign dissidents — Whether authorities in receiving State entitled to institute criminal proceedings for offences committed on embassy premises — Whether embassy premises forming part of territory of receiving State

Relationship of international law and municipal law — Crimes against international law — Seizure of embassy and taking of hostages — Whether perpetrators subject to criminal prosecution in receiving State — Whether defence of necessity available to perpetrators seeking to draw attention to unlawful acts of communist government — Principle of proportionality — The law of Switzerland