The U.N. will, at best, play the most limited of roles, given the revival of great power rivalry and the emergence of dangerous regional states and subnational entities like ISIS.

考虑到大国相争浪潮正在复兴，ISIS之类的危险地区国家以及和地方政权也在蠢蠢欲动，联合国至多也只能发挥微乎其微的作用。