Peacekeeping

Peacekeeping prevents war and violence, especially using armed forces not involved in a disagreement to prevent fighting [Cambridge Online Dictionary].
Peacekeeping refers to the deployment of national or, more commonly, multinational forces to help to control and resolve an actual or potential armed conflict between or within states. Most peacekeeping operations are undertaken with authorization and are often led by the United Nations (UN). Still, regional organizations may also conduct peacekeeping operations; in some cases, single states have undertaken such operations. Peacekeeping forces are normally deployed with the parties' consent to a conflict and in support of a ceasefire or other agreed-upon peace measures. Peacekeeping forces are, therefore, usually unarmed or only lightly armed and use the minimum of force necessary and then only exceptionally. Peace enforcement refers to using military assets to enforce peace against the will of the parties to a conflict when, for instance, a ceasefire has failed. Peace enforcement often exceeds the capacity of peacekeeping forces and is thus better executed by more heavily armed forces [Princeton University].

Sources:

Peacekeeping. Cambridge Online Dictionary. Retrieved from: https://dictionary.cambridge.org/dictionary/english/peacekeeping

Peacekeeping / Peace Enforcement. Princeton University. Retrieved from: https://pesd.princeton.edu/node/561