The end of the Cold War in 1991 sparked a great debate about the fate of the international order and, in particular, of the so-called Westphalian system in which nation-states were the main actors. Since the end of the bloody Wars of Religion in 1648, there has been, in short, a sort of understanding that the international system should concern itself with wars between states, not wars within states. The problem is, however, that many conflicts today belong in the second category. In its endeavours to keep the peace, the international community has to adjust to this reality. The question is how.
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