Liechtenstein's foreign economic policy has been dominated by its customs union with Switzerland (and with Austria-Hungary until World War I). This union also led to its independent membership in the European Free Trade Association (EFTA) in 1991. Unlike Switzerland however (where citizens rejected membership in a referendum), Liechtenstein is part of the European Economic Area.
Liechtenstein was admitted to the United Nations in 1990. It is not a member of most specialized agencies of the United Nations, with the exceptions of the International Telecommunication Union, the Universal Postal Union and the World Intellectual Property Organization.
Liechtenstein has resorted two times to international dispute settlement by the International Court of Justice, in the Nottebohm (Liechtenstein v. Guatemala) case against Guatemala in the 1950s and in a case concerning art property of the Liechtenstein family against Germany in 2005. It lost in both cases.
Liechtenstein maintains resident embassies in Austria, Belgium, Germany, Holy See, Switzerland and the United States, along with a number of missions to international organisations. Under a 1919 agreement between Liechtenstein and Switzerland, ambassadors of Switzerland are authorised to represent Liechtenstein in countries and in diplomatic situations unless Liechtenstein opts to send its own ambassador.[1] As of 2024, Liechtenstein has diplomatic relations with 133 UN countries.[2]