Rarely does an ethnic conflict remain wholly confined to its country of origin. Because ethnic groups often have members across international borders, their civil wars can have a strong influence on neighboring countries’ politics, impelling kindred communities to push for their state to intervene in support of imperilled relatives across the border. At the same time, strategic thinkers often find it tempting to destabilize neighboring countries, or to oppose groups acting as proxies for regional rivals. Because of such considerations, intervention in ethnic civil war becomes a political issue for the neighbors, with the emotional stakes often strengthening the hands of nationalists in the neighboring countries.