The history of diplomacy has been a history of two competing structural conceptions: sovereignty, the barrier that limits state power, and community values, the collective power that overcomes that barrier. In ages past, when the fault line shifted between sovereignty and community, and cracks began to appear in the old legal edifice governing use of force by sovereign against sovereign or community against sovereign, the leading nations of the world gathered at Westphalia, or Vienna, or Versailles, or San Francisco to clarify the contours of the new order and to formulate, however loosely, a set of rules that would govern the use of force for generations to come—rules that recognized states as equals, rules that prohibited aggression, rules that permitted only defensive force. But not this time.