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A defense pact or defence pact Commonwealth spelling is a type of treaty or military alliance which the signatories promise to support each other militarily and to defend each other. Generally, the signatories point out the threats and concretely prepare to respond to it together. Collective defence means that an attack against one Ally is considered as an attack against all Allies. The principle of collective defence is enshrined in Article 5 of the North Atlantic Treaty.
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