After decades of globalisation and integration, the world seems to be fragmenting again, epitomised best, perhaps, by the return of geopolitics, protectionism, unilateral sanctions, treaty withdrawals, and even military and economic coercion. Challenged by the United States, the return of old (Russia) and the growing assertion of new (China) antiliberal powers, the multilateral system is shaken both in its normative foundations and its operational capacity.