North Atlantic Treaty Organization
| Organisation du Traité de l'Atlantique Nord | |
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Member states of NATO
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| Abbreviation | NATO, OTAN |
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| Formation | 4 April 1949 |
| Type | Military alliance |
| Headquarters | Brussels, Belgium |
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Membership
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Official language
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English French |
| Jens Stoltenberg | |
| Petr Pavel | |
| Curtis Scaparrotti | |
| Denis Mercier | |
| Expenses (2015) | $866,971 million |
| Website | nato |
Coordinates: 50°52′34″N 4°25′19″E / 50.87611°N 4.42194°E
The North Atlantic Treaty Organization (NATO /ˈneɪtoʊ/; French: Organisation du Traité de l'Atlantique Nord; OTAN), also called the North Atlantic Alliance, is an intergovernmental military alliance based on the North Atlantic Treaty which was signed on 4 April 1949. The organization constitutes a system of collective defence whereby its member states agree to mutual defence in response to an attack by any external party. NATO's headquarters are located in Haren, Brussels, Belgium, where the Supreme Allied Commander also resides. Belgium is one of the 28 member states across North America and Europe, the newest of which, Albania and Croatia, joined in April 2009. An additional 22 countries participate in NATO's Partnership for Peace program, with 15 other countries involved in institutionalized dialogue programmes. The combined military spending of all NATO members constitutes over 70% of the global total. Members' defence spending is supposed to amount to 2% of GDP.
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