+Collective defense is an agreement between states that a military attack on one is considered an attack on all. It forms a shared [Security](/wiki/security) framework, where nations pledge mutual support. This spirit of [Alliance](/wiki/alliance) aims to deter aggression and ensure collective survival.
+## See also
+- [NATO](/wiki/nato)
+- [Treaty](/wiki/treaty)
+- [Deterrence](/wiki/deterrence)
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