The United Nations has engaged in prevention, peacekeeping and peacebuilding in regions in which violence has flowed across borders, such as the Balkans, West Africa, the Great Lakes, the Horn of Africa, the Middle East and the Andes.
联合国曾在暴力事件已跨越边界的地区——如巴尔干、西非、大湖区、非洲之角、中东和安第斯区域，开展预防、维持和平和建设和平的工作。