nonproliferation
noun(non-pro-lif-er-a-tion)
the prevention of something increasing or spreading (especially the prevention of an increase in the number of countries possessing nuclear weapons)
Synonyms: non-proliferation,
Examples:
They protested that the nonproliferation treaty was just a plot to maintain the hegemony of those who already had nuclear weapons.
Nuclear disarmament and nonproliferation are closely related goals.