Factors that have limited ability of the international community

What are the key factors that have limited the ability of the international communit [external state actors] to intervene effectively to prevent or control ethnic conflict? Support your argument with examples and theoretical concepts. The  ability of the international community is a vague phrase used in geopolitics and international relations to refer to a broad group of people and governments of the world. It does not literally refer to all nations or states in the world.