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One of the examples that I am most familiar with is the conflict in the Balkans, Kosova, Croatia and Bosnia-Herzegovina. These republics have been part of the country known as Yugoslavia. During the 90's the president of Serbia, which is another republic of Yugoslavia decided to start a war demanding more land and power for his nationals. After the break up of the republics the wars were being started for ridiculous reasons, but even though there weren't good reasons people were still being killed. And at this point the international community was saying this is and internal war, or civil war and that they should not interfere since the laws drawn by the law makers at United Nations decided that in countries like these there should not be any intervention. Here is an example of what they had written down in 1962 as far as interventions: "Chapter VIII, Article 53, prohibits enforcement action (as distinguished from action in self-defense) by regional agencies without the authorization of the U.N. Security Council. In 1962 the International Court of Justice said that enforcement action is coercive action in the context of Chapter VII, which deals with threats to the peace, breaches of the peace and acts of aggression. If the NATO action is designed to coerce the Yugoslav government to accept the allied peace plan for Kosovo, it would require Security Council authorization under Article 53. On the other hand, if the NATO action is designed to ensure humanitarian relief for the people of Kosovo or merely to help them to repel armed aggression, one could argue that Security Council authorization may not be necessary." .
But, who should the United Nations and other international agencies listen to? The people of the troubled countries or their governments that is responsible for the conflict. Most other countries that have civil wars are one country only with few of its nationals against the government, where in the case of the Yugoslavia these were different republics with different religion, language and different mentality.