Collective defense
Collective defense is an arrangement in which allied states commit to defending one another if attacked. A collective defense clause expresses that mutual protection commitment within an alliance.
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Collective defense is intended to deter aggression by increasing the expected cost of attacking an individual member: an aggressor must consider the prospect of a response from that member's allies.
VerifiedCollective defense responses can include diplomatic, economic or military measures. A collective defense clause does not necessarily compel military action automatically; the form of assistance can depend on member discretion.
VerifiedCollective defense focuses on protecting members of a particular alliance against attacks. Collective security describes a broader arrangement among states to maintain peace and respond to aggression, often through international bodies rather than a particular defense alliance.
VerifiedNATO invoked its Article 5 collective defense clause following the September 11, 2001 attacks, leading member states to support the United States' response.
Verified · 2001A collective defense commitment does not guarantee absolute security. Political considerations, differences in national interests and problems with alliance cohesion can affect how members implement their commitments.
VerifiedA collective defense clause can treat an attack on one alliance member as an attack on all members, providing the basis for a joint response to defend the attacked member.
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