one thing to mention in this discussion is the nuclear nonproliferation treaty
EDIT: i know this isn't quite what you're talking about, but i included it for reference
basically says that existing nuclear powers scale down their arsenal and non-nuclear states will remain non-nuclear. this has not been completely followed, as india/pakistan/israel got the bomb...and supposedly north korea...and iran seems to want to. alternately, the US probably has not scaled back as much as it could.
http://www.un.org/Depts/dda/WMD/treaty/
http://en.wikipedia.org/wiki/Nuclear...eration_Treaty