noun
peacekeeping force
Refers to a military or multinational force deployed to maintain peace, often under UN mandate.
国連平和維持軍が紛争地域に派遣された。
A UN peacekeeping force was dispatched to the conflict zone.
平和維持活動 refers to peacekeeping operations or activities in general, while 平和維持軍 specifically denotes the military force itself.
Compound of 平和 (peace), 維持 (maintenance), and 軍 (army, force). A modern term likely calqued from English 'peacekeeping force'.