The North Atlantic Treaty Organization, also called the North Atlantic Alliance, is an intergovernmental transnational military alliance of 32 member states—30 European and 2 North American. Established in the aftermath of World War II, the organization implements the North Atlantic Treaty, signed in Washington, D.C., on 4 April 1949. NATO is a collective security system: its independent member states agree to defend each other against attacks by third parties. During the Cold War, NATO operated as a check on the threat posed by the Soviet Union. The alliance remained in place after the dissolution of the Soviet Union and the Warsaw Pact, and has been involved in military operations in the Balkans, the Middle East, South Asia, and Africa. The organization's motto is animus in consulendo liber. The organization's strategic concepts include deterrence.
The North Atlantic Treaty, also known as the Washington Treaty, forms the legal basis of, and is implemented by, the North Atlantic Treaty Organization (NATO). The treaty was signed in Washington, D.C., on 4 April 1949.
The Western European Union was the international organisation and military alliance that succeeded the Western Union (WU) after the 1954 amendment of the 1948 Treaty of Brussels. The WEU implemented the Modified Brussels Treaty. During the Cold War, the Western Bloc included the WEU member-states, plus the United States and Canada, as part of the North Atlantic Treaty Organization (NATO).
The Euro-Atlantic Partnership Council (EAPC) is a post–Cold War, North Atlantic Treaty Organization (NATO) institution. The EAPC is a multilateral forum created to improve relations between NATO and non-NATO countries in Europe and Central Asia. States meet to cooperate and discuss political and security issues. It was formed on 29 May 1997 at a Ministers’ meeting held in Sintra, Portugal, as the successor to the North Atlantic Cooperation Council (NACC), which was created in 1991.
The Partnership for Peace is a North Atlantic Treaty Organization (NATO) program aimed at creating trust and cooperation between the member states of NATO and other states mostly in Europe, including post-Soviet states; 18 states are members. The program contains 6 areas of cooperation, which aims to build relationships with partners through military-to-military cooperation on training, exercises, disaster planning and response, science and environmental issues, professionalization, policy planning, and relations with civilian government. During policy negotiations in the 1990s, a primary controversy regarding PfP was its ability to be interpreted as a program that is a stepping stone for joining NATO with full Article 5 guarantees.
Eurocorps, located in the French city of Strasbourg (Bas-Rhin), is a multinational corps headquarters. Founded by France and Germany in 1992, it is today composed of personnel from six framework nations and five associated nations. The framework nations place the Eurocorps at the service of the European Union (EU) and NATO, which certified it in 2002 as one of its nine High Readiness Land Headquarters.
Atlanticism, also known as Transatlanticism, is the ideology which advocates a close alliance between nations in Northern America and in Europe on political, economic, and defense issues. The term derives from the North Atlantic Ocean, which is bordered by North America and Europe.
The Common Security and Defence Policy (CSDP) is the European Union's (EU) course of action in the fields of defence and crisis management, and a main component of the EU's Common Foreign and Security Policy (CFSP).
A major non-NATO ally (MNNA) is a designation given by the United States government to countries that have strategic working relationships with the United States Armed Forces while not being members of the North Atlantic Treaty Organization (NATO). While the status does not automatically constitute a mutual defense pact with the United States, it does confer a variety of military and financial advantages that are otherwise unobtainable by non-NATO countries. There are currently 20 major non-NATO allies across four continents: 11 in Asia, 4 in Africa, 3 in South America, and 2 in Oceania.
Georgia and the North Atlantic Treaty Organization (NATO) enjoy cordial relations. Georgia is not currently a member of NATO, but has been promised by NATO to be admitted in the future.
NATO is a military alliance of thirty-two European and North American countries that constitutes a system of collective defense. The process of joining the alliance is governed by Article 10 of the North Atlantic Treaty, which allows for the invitation of "other European States" only and by subsequent agreements. Countries wishing to join must meet certain requirements and complete a multi-step process involving political dialogue and military integration. The accession process is overseen by the North Atlantic Council, NATO's governing body. NATO was formed in 1949 with twelve founding members and has added new members ten times. The first additions were Greece and Turkey in 1952. In May 1955, West Germany joined NATO, which was one of the conditions agreed to as part of the end of the country's occupation by France, the United Kingdom, and the United States, prompting the Soviet Union to form its own collective security alliance later that month. Following the end of the Franco regime, newly democratic Spain chose to join NATO in 1982.
Relations between the NATO military alliance and the Russian Federation were established in 1991 within the framework of the North Atlantic Cooperation Council. In 1994, Russia joined the Partnership for Peace program, and on 27 May 1997, the NATO–Russia Founding Act (NRFA) was signed at the 1997 Paris NATO Summit in France, enabling the creation of the NATO–Russia Permanent Joint Council (NRPJC). Through the early part of 2010s NATO and Russia signed several additional agreements on cooperation. The NRPJC was replaced in 2002 by the NATO-Russia Council (NRC), which was established in an effort to partner on security issues and joint projects together.
The Western Union (WU), also referred to as the Brussels Treaty Organisation (BTO), was the European military alliance established between France, the United Kingdom (UK) and the three Benelux countries in September 1948 in order to implement the Treaty of Brussels signed in March the same year. Under this treaty the signatories, referred to as the five powers, agreed to collaborate in the defence field as well as in the political, economic and cultural fields.
NATO maintains foreign relations with many non-member countries across the globe. NATO runs a number of programs which provide a framework for the partnerships between itself and these non-member nations, typically based on that country's location. These include the Euro-Atlantic Partnership Council and the Partnership for Peace.
This article outlines the history of the Common Security and Defence Policy (CSDP) of the European Union (EU), a part of the Common Foreign and Security Policy (CFSP).
The history of the North Atlantic Treaty Organization (NATO) begins in the immediate aftermath of World War II. In 1947, the United Kingdom and France signed the Treaty of Dunkirk and the United States set out the Truman Doctrine, the former to defend against a potential German attack and the latter to counter Soviet expansion. The Treaty of Dunkirk was expanded in 1948 with the Treaty of Brussels to add the three Benelux countries and committed them to collective defense against an armed attack for fifty years. The Truman Doctrine expanded in the same year, with support being pledged to oppose the communist rebellions in Greece and Czechoslovakia, as well as Soviet demands from Turkey. In 1949, the NATO defensive pact was signed by twelve countries on both sides of the North Atlantic – the five Brussels signatories, the United States, Canada, Italy, Portugal, Norway, Denmark, and Iceland. Greece and Turkey joined in 1952, West Germany joined in 1955, Spain joined in 1982, Czech Republic, Hungary and Poland joined in 1999, Bulgaria, Estonia, Latvia, Lithuania, Romania, Slovakia, and Slovenia joined in 2004, Albania and Croatia joined in 2009, Montenegro joined in 2017, North Macedonia joined in 2020, Finland joined in 2023, and Sweden joined in 2024.
Withdrawal from the North Atlantic Treaty Organization (NATO) is the legal and political process whereby a member of the North Atlantic Treaty Organisation withdraws from the North Atlantic Treaty, and thus the country in question ceases to be a member of NATO. The formal process is stated in article 13 of the Treaty. This says that any country that wants to leave must send the United States a "notice of denunciation", which the U.S. would then pass on to the other Allies. After a one-year waiting period, the country that wants to leave would be out.
The European Union (EU) and the North Atlantic Treaty Organisation (NATO) are two main treaty-based Western organisations for cooperation between member states, both headquartered in Brussels, Belgium. Their natures are different and they operate in different spheres: NATO is a purely intergovernmental organisation functioning as a military alliance, which serves to implement article 5 of the North Atlantic Treaty on collective territorial defence. The EU on the other hand is a partly supranational and partly intergovernmental sui generis entity akin to a confederation that entails wider economic and political integration. Unlike NATO, the EU pursues a foreign policy in its own right—based on consensus, and member states have equipped it with tools in the field of defence and crisis management; the Common Security and Defence Policy (CSDP) structure.
Armenia and the North Atlantic Treaty Organization (NATO) have maintained a formal relationship since 1992, when Armenia joined the North Atlantic Cooperation Council. Armenia officially established bilateral relations with NATO in 1994 when it became a member of NATO's Partnership for Peace (PfP) programme. In 2002, Armenia became an Associate Member of the NATO Parliamentary Assembly.
In the context of the enlargement of NATO, Article 10 of the North Atlantic Treaty is the origin for the April 1999 statement of a "NATO open door policy". The open door policy requires a consensus in favour of countries applying to join NATO, as all member states must ratify the protocol enabling a new country to become a member of NATO. The open door policy "is aimed at promoting stability and cooperation".
