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Three of NATO's members are nuclear weapons states: France, the United Kingdom, and the United States. NATO has 12 original founding member states. Three more members joined between 1952 and 1955, and a fourth joined in 1982. Since the end of the Cold War, NATO has added 16 more members from 1999 to 2024. [1]
The next member states to join NATO were Montenegro on 5 June 2017, and North Macedonia on 27 March 2020. Russia invaded Ukraine in 2022 after Russia's president, Vladimir Putin , falsely claimed that NATO military infrastructure was being built up inside Ukraine and that Ukraine's potential future membership was a threat.
It commits each member state to consider an armed attack against one member state, in the areas defined by Article 6, to be an armed attack against them all. Upon such attack, each member state is to assist by taking "such action as [the member state] deems necessary, including the use of armed force, to restore and maintain the security of the ...
Sweden became the newest member of NATO earlier this month, joining 31 nations in the security alliance, including the United States. Well, make that 49 of the United States. This US state is not ...
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Map of NATO enlargement (1952–present). 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.
NATO's "area of responsibility", within which attacks on member states are eligible for an Article 5 response, is defined under Article 6 of the North Atlantic Treaty to include member territory in Europe, North America, Turkey, and islands in the North Atlantic north of the Tropic of Cancer.
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". [1] [2] 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.