"[NATO] is an intergovernmental military alliance between 28 European countries and 2 North American countries. [...] NATO constitutes a system of collective security, whereby its independent member states agree to mutual defense in response to an attack by any external party. [...]
Since its founding, the admission of new member states has increased the alliance from the original 12 countries to 30. The most recent member state to be added to NATO was North Macedonia on 27 March 2020. NATO currently recognizes Bosnia and Herzegovina, Georgia, and Ukraine as aspiring members. [...] Members agreed that their aim is to reach or maintain the target defence spending of at least 2% of their GDP by 2024."
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