This disadvantage argues that the affirmative plan will cause other nations to acquire nuclear weapons. The major link is that currently our allies feel secure because we protect them with our "nuclear umbrella," meaning if they are attacked we will protect them without nuclear weapons. When we reduce our emphasis on nuclear weapons these nations doubt our protection and get nuclear weapons of their own.
There is substantial evidence in the so-called "Rogues" negative section which provides additional link and impact evidence for those nations of concern.