VCDR (Vienna Convention on Diplomatic Relations)

The Vienna Convention on Diplomatic Relations (VCDR) was adopted on 18 April 1961 at a UN conference in Vienna and entered into force on 24 April 1964. It is one of the most widely ratified treaties in the world, with nearly universal participation, and is generally regarded as reflecting customary international law on diplomacy.

The VCDR codifies the legal framework governing permanent diplomatic missions between states. Key provisions include:

• Article 22 – the premises of the mission are inviolable; agents of the receiving state may not enter without the head of mission's consent, and the receiving state has a special duty to protect the premises.
• Article 24 – the archives and documents of the mission are inviolable at any time and wherever they may be.
• Article 27 – freedom of communication for official purposes, including the inviolability of the diplomatic bag and the diplomatic courier.
• Article 29 – the person of a diplomatic agent is inviolable; they may not be arrested or detained.
• Article 31 – diplomatic agents enjoy immunity from the criminal jurisdiction of the receiving state, and from civil and administrative jurisdiction with limited exceptions.
• Article 32 – immunity may be waived only by the sending state, and waiver must be express.
• Article 9 – the receiving state may at any time declare a diplomat persona non grata, without explanation.

The VCDR distinguishes among diplomatic agents, administrative and technical staff, service staff, and private servants, each enjoying different levels of immunity. It governs accreditation, the functions of missions (Article 3, including representation, negotiation, and reporting), and the obligation of diplomats to respect the laws of the receiving state and not interfere in its internal affairs (Article 41).

A companion instrument, the Vienna Convention on Consular Relations (VCCR) of 1963, performs an analogous function for consular posts, which enjoy narrower immunities. Disputes under the VCDR have been litigated at the International Court of Justice, most notably in United States Diplomatic and Consular Staff in Tehran (Iran Hostages case, 1980).