Use of force in peacekeeping refers to the legal and operational rules governing when UN personnel deployed under a Security Council mandate may resort to armed coercion. It sits at the intersection of the UN Charter, mission-specific Security Council resolutions, and mission-level Rules of Engagement (ROE) issued by the Department of Peace Operations.
Classical peacekeeping rested on three principles articulated in the Capstone Doctrine (2008): consent of the parties, impartiality, and the non-use of force except in self-defence and defence of the mandate. Early missions such as UNEF I (1956) and UNFICYP (1964) carried only light arms and treated force as a last resort. The doctrinal line between Chapter VI ("Pacific Settlement") and Chapter VII ("Action with Respect to Threats to the Peace") missions hardened the distinction between peacekeeping and peace enforcement.
That line has eroded. After the failures of UNPROFOR in Srebrenica (1995) and UNAMIR in Rwanda (1994), the Brahimi Report (2000) urged more robust rules permitting force to protect civilians. Since then, the Council has routinely invoked Chapter VII to authorise missions to use "all necessary means" to protect civilians under imminent threat — language used for MONUSCO in the DRC, UNMISS in South Sudan, and MINUSMA in Mali. MONUSCO's Force Intervention Brigade, created by Resolution 2098 (2013), was explicitly tasked with offensive operations against armed groups, a notable departure from impartiality.
Key constraints remain. Force must be necessary, proportionate, and minimal, applied at the tactical level, and consistent with international humanitarian law and the UN's Human Rights Due Diligence Policy (2013). The 2015 HIPPO Report reaffirmed that peacekeeping is not counter-terrorism and warned against blurring the two. Persistent debates concern protection-of-civilians failures, troop-contributing countries' national caveats, and whether robust mandates undermine consent — issues central to the 2023 New Agenda for Peace discussions.
Example
In March 2013, UN Security Council Resolution 2098 authorised MONUSCO's Force Intervention Brigade to conduct targeted offensive operations against the M23 and other armed groups in eastern DRC.
Frequently asked questions
Generally no, but exceptions exist where the Security Council explicitly authorises offensive action, such as MONUSCO's Force Intervention Brigade under Resolution 2098 (2013).
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