Exceptions to the Prohibition of the Use of Force in International Law

Overview of Exceptions to the Prohibition of the Use of Force

• The general prohibition on the use of force in international law is subject to several specific exceptions, which are categorized as follows:
  • Collective Security System: Governed by Chapter VII (actions by the UN Security Council) and Chapter VIII (actions by Regional Organizations) of the UN Charter.
  • Self-Defence: The inherent right of states to protect themselves from armed attacks.
  • Consent: When a state invites or allows another state to use force within its territory.
  • Humanitarian Intervention: A controversial and debated exception involving the use of force to prevent mass atrocities.

Legitimate Self-Defence and Article $51$

• Article $51$ of the UN Charter: "Nothing in the present Charter shall impair the inherent right of individual or collective self-defence if an armed attack occurs against a Member of the United Nations, until the Security Council has taken measures necessary to maintain international peace and security. Measures taken by Members in the exercise of this right of self-defence shall be immediately reported to the Security Council and shall not in any way affect the authority and responsibility of the Security Council under the present Charter to take at any time such action as it deems necessary in order to maintain or restore international peace and security."
• Armed Attack as a 'Condicio Sine Qua Non':
  • An armed attack is the essential prerequisite for the legal exercise of self-defence.
  • Regular Forces: An attack by the regular forces of a state's army is a clear instance (as defined in UN General Assembly Resolution $3314$ of $1974$).
  • Indirect Aggression: This involves a state sending armed groups to carry out attacks on its behalf.
  • International Terrorism and Non-State Actors: The events of September $11$, $2001$, raised significant questions about whether the concept of an armed attack can include actions by non-state actors.
• UN Security Council Resolutions $1368$ and $1373$ ($2001$):
  • These resolutions defined terrorism as a "threat to peace" rather than explicitly as an "armed attack."
  • However, the right to self-defence was invoked in the preambles of these resolutions, which represents an implicit acceptance that large-scale terrorist attacks can constitute an armed attack triggering the right to self-defence.

Timing and Imminence of the Response

• Procedural Requirements for the Timing of Response:
  • Beginning: Under customary international law, the response in self-defence must be immediate.
  • End: The right to use self-defence lasts only until the Security Council has adopted "necessary measures." These measures must be suitable, effective, and involve the use of force specifically for the maintenance of peace for the state's right to self-defence to cease.
• Preventive vs. Pre-emptive Self-Defence:
  • The theory of preventive self-defence has evolved alongside the development of advanced armaments and delivery systems.
  • Case Study - Israeli Attack ($1981$): Israel attacked the Iraqi nuclear reactor at Osirak, claiming preventive self-defence.
  • The Bush Doctrine ($2002$): The U.S. National Security Strategy and the subsequent attack on Iraq in $2003$ focused on preventing future threats from materializing.
• Distinction by the High-Level Panel ($2004$):
  • Pre-emptive (Anticipatory) Self-Defence:
    • Definition: A response to an imminent armed attack.
    • Nature of Threat: The threat is immediate, unavoidable, and "instant, overwhelming, leaving no choice of means."
    • Legality: Generally considered lawful under customary international law.
    • Aim: To stop an attack that is about to happen.
  • Preventive Self-Defence:
    • Definition: A response to a potential or future threat.
    • Nature of Threat: There is no imminence; the attack is speculative, uncertain, or distant in time.
    • Legality: Highly controversial and generally not accepted under international law.
    • Aim: To eliminate a possible future risk.

Additional Requirements for the Use of Force in Self-Defence

• Collective Self-Defence: This action must be based on an explicit request by the State that has been attacked. In some cases, this is institutionalized through pacts like NATO. According to Article $5$ of the NATO treaty, an attack against one member is considered an attack against all.
• Necessity: Repelling an attack must be the only option; there must be no peaceful means available to achieve the aim (a requirement of customary law).
• Proportionality: The force used must be strictly limited to what is necessary to repel the attack; it must not exceed the scale of the initial aggression (a requirement of customary law).

Regional Organizations and Chapter VIII

• Historical Context from the San Francisco Conference:
  • Universalism: The idea that peace is indivisible; actions taken by individual states or regional bodies affect the entire international system. This led to the creation of the Security Council as the body with primary responsibility.
  • Regionalism: Recognition that countries with shared cultural and political systems are essential intermediate structures for cooperation.
• Constitutional Compromise in the Charter:
  • Universalist Pillar: Maintenance of peace as a purpose; Security Council primacy.
  • Individualist Pillar: The inherent right of self-defence.
  • Regionalist Pillar: Recognition of collective self-defence and regional arrangements.
• Specific Articles of Chapter VIII:
  • Article $52$: Permits regional arrangements/agencies for maintaining peace and security, provided they align with UN principles. Members should try to achieve the "pacific settlement of local disputes" through these regional bodies before involving the Security Council.
  • Article $53$: The Security Council may utilize regional bodies for "enforcement action," but no enforcement action shall be taken by regional agencies without explicit authorization from the Security Council.
  • Article $54$: The Security Council must be kept fully informed at all times of activities undertaken or contemplated by regional agencies for maintaining peace.
• Authorization Issues:
  • Implicit Authorization: This may be inferred if the Security Council's intentions are unequivocal (e.g., expressions of gratitude or approval). Silence, inactivity, or failure to convict are not considered implicit authorization.
  • Ex Post Facto Authorization: This is highly controversial, referring to authorization given after the fact to remedy a violation.
  • Case - ECOWAS in Sierra Leone ($1997$): Intervened to restore a democratically elected government; the UN later adopted resolutions acknowledging and supporting the presence of ECOWAS forces.
  • Case - NATO in Kosovo ($1999$): Intervention occurred without explicit prior authorization due to a P$5$ deadlock. Resolution $1244$ ($1999$) was later adopted to establish international administration (UNMIK/KFOR). It is debated if this constitutes ex post authorization.

Consent as a Justification for Force

• Legal Basis: Consent is a circumstance that precludes the wrongfulness of an act that would otherwise violate international law. Using force based on "invitation" by a host state does not violate Article $2(4)$.
• Requirements for Validity:
  1. The consent must be provided without any coercion.
  2. The invited state must respect the specific limits of the consent.
• Case Study: Congo v Uganda ($2005$) at the ICJ:
  • In $1997$, Uganda and Rwanda helped President Kabila come to power in the DRC following an invitation of their military forces.
  • Relations deteriorated and Kabila withdrew consent on July $28$, $1998$.
  • Uganda continued military activities, claiming self-defence against DRC-supported rebels.
  • The ICJ held that consent is limited in duration (stops upon withdrawal) and scope (foreign forces must stay within the agreed limits).

Humanitarian Intervention

• Definition: Military intervention by a state or coalition in a third state's territory without that state's consent and without Security Council authorization, intended to end atrocities against the local population.
• Key Features:
  • Carried out for the citizens of another state (not for one's own citizens).
  • Lack of territorial consent.
  • Unilateral (no Security Council authorization).
• The Legality Debate:
  • The 'Illegal' Argument: Based on Article $2(4)$, which prohibits the threat or use of force against "territorial integrity or political independence." Humanitarian intervention is viewed as a violation of territorial inviolability.
  • The 'Legal' or 'Legitimate' Argument:
    1. Interpretation of Article $2(4)$: Intervention is not directed against territorial integrity but for the UN's purposes. Articles $55$ and $56$ commit members to protect fundamental rights.
    2. Balancing Purposes: If human rights are essential to international peace, the prohibition on force should be reduced in cases of serious violations.
• Criteria for Conditional Legitimacy:
  • Serious cases only (genocide, crimes against humanity).
  • Genuinely humanitarian primary purpose.
  • Respect for proportionality.
  • Limited duration.
  • Respect for international humanitarian law by the intervening force.