A total of 147 non-nuclear states have expressed support for the ban treaty process, while 37 non-nuclear states have not.… [But] a single variable correlates almost perfectly with this breakdown: 89 percent of the non-nuclear states that have criticized the ban are “umbrella states” that belong to an alliance with a nuclear power or are actively seeking to join such an alliance, while only 4 percent of the non-nuclear states supporting the ban are umbrella states.