Russia’s annexation of Crimea is indicative of a fundamentally weakened West. But could it also, paradoxically, give the West a stronger role in global affairs?

"Global Zero" has become a well-known slogan to revive the decades-old idea of eliminating all nuclear weapons. Interest in abolition has been renewed by the concern that the use of nuclear weapons could become ever more likely. With nuclear deterrence we bought time, but it would be a tremendous mistake to believe that deterrence will always work.