Imminence doctrine debate

Lens adapted to this topic: The case for constrained anticipatory self-defense

This perspective treats imminence as a necessary limit on anticipatory force but argues that it cannot always mean an attack is seconds or days away. It emphasizes the Caroline criteria and may allow narrowly defined preemptive action where an attack is sufficiently concrete, immediate in practical terms, and no reasonable alternative exists. Some proponents argue that modern weapons and non-state threats make rigid timing rules unworkable, while still rejecting broad preventive war against merely future risks.

• A state need not always wait for an attack to begin if the threat is sufficiently immediate and force is necessary, but the conditions for lawful action should remain highly restrictive.
• Modern technology and terrorist groups can reduce warning time, making a purely chronological definition of imminence difficult to apply.
• The Caroline formula remains a central safeguard: necessity must be instant and overwhelming, with no choice of means and no time for deliberation.
• The Bush doctrine’s authorization of force against non-imminent threats is generally distinguished from narrower anticipatory self-defense.

Lens adapted to this topic: The case against expanding imminence

This perspective argues that recent state practice and policy have diluted imminence until it no longer meaningfully limits force. It stresses that the UN Charter does not create a general right to attack future dangers and warns that broad claims based on uncertain intelligence, continuing terrorist activity, or hypothetical retaliation can transform self-defense into prevention. Critics also argue that expanded doctrines undermine necessity, proportionality, and the stability of the jus ad bellum regime.

• The UN Charter does not expressly authorize attacks based merely on an alleged future danger, and claims that a threat is imminent cannot substitute for the Charter’s limits on force.
• Expanding imminence to cover uncertain or temporally remote threats weakens the necessity requirement and risks destabilizing the law governing the use of force.
• Targeted-killing policies have been criticized for redefining imminence by relaxing its temporal requirement when the time and place of an alleged attack are unknown.
• The “unwilling or unable” doctrine is criticized for lowering the armed-attack threshold and removing the temporal component of imminence in operations against non-state actors.
• Applying self-defense to a predicted response to another state’s anticipated attack illustrates how expansive reasoning can produce layered or speculative preemption.