Legitimacy in Peacekeeping: Civilian Support Hinges on Peacekeeper Behavior, Not Outcomes

As international support for United Nations (UN)-led peacekeeping declines, and missions increasingly shift toward regionally led operations—particularly under the African Union—the question of peacekeeping legitimacy has become more urgent. Peacekeeping is often characterized as legitimate by international organizations if it is effective in its mission, with an emphasis on material capacity, mandate strength, and troop numbers. But what do civilians on the ground think? Given that peacekeeping is meant to serve and protect civilians, what factors explain why some missions retain civilian cooperation even under severe constraints while others experience distrust and disengagement?

Drawing on original experimental evidence from Somalia and South Sudan, this brief demonstrates that civilian evaluations of peacekeepers are shaped by perceived normative alignment rather than protection outcomes alone. Civilians assess whether peacekeepers’ observable behavior aligns with local expectations about effort, priority, and responsibility. When peacekeepers are perceived as acting in accordance with these expectations—even when protection fails—legitimacy and cooperation remain resilient. When behavior signals normative misalignment, legitimacy declines sharply, even in the absence of abuse or overt failure.

These findings have direct implications for how peacekeeping missions should train personnel, design patrols, communicate constraints, and assess mission performance in an era of declining international backing.

Thumbnail credit: UN Photo