The three categories are, first, the pressures and demands of a rising great power (China) that is seeking to define its own space in world affairs and thereby to reinterpret or recreate international rules in its own interest. Second, the difficulty of dealing with a declining, somewhat paranoid former superpower (Russia) that is throwing its weight around in order to create (or preserve) its sense of national identity, and is seeking to prove that rules of the game do not apply to it. Third, what might best be termed the civilisational challenge posed by Islamic State, its precursors and no
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