NATO's Article 5, which requires member states to come to the aid of another member who was attacked, is an example of collective security.

Question

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This is correct. Collective security is a system in which member states agree to provide mutual defense and support in the case of an attack on any one member state. NATO's Article 5 is a prime example of this concept, as it requires all member states to come to the aid of a fellow member that has been attacked.

NATO's Article 5, Which Requires Member States to Come to the Aid