anti-proliferation
/ˌantiprəlɪfəˈreɪʃn/adjective
1Designating an agreement or other measure intended to limit or halt the proliferation of nuclear weapons.
2Of or designating a person or group opposed to the proliferation of nuclear weapons, especially their acquisition by countries currently without them.
Origin
1960s; earliest use found in The Times. From anti- + proliferation.