Answer: The UN has an enforcement arm to aid in peacekeeping.
Explanation:
The League of Nation´s main goal was to deter any future worldwide armed conflict and to keep world peace through disarmament and arbitration in resolving international conflicts. WWII proved that the League had failed its main mission, so it was replaced by the United Nations (UN) after the war.
The UN established the Security Council, which has the power to apply armed enforcement actions when the mediation of international conflicts fails to force states to comply with peaceful negotiations.
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Blitzkrieg would be your answer! Hoped that helped!