NATO's Article 5

NATO's Article 5 is a key principle of the North Atlantic Treaty, stating that an armed attack against one member is considered an attack against all members. This means if a NATO country is attacked, the other member countries are obligated to come to its defense, potentially using military force. Article 5 emphasizes collective security, ensuring that allies stand together to deter aggression and maintain peace. It has only been invoked once, after the September 11 attacks in 2001, showcasing NATO's commitment to mutual defense among its members.