noun
arms proliferation; weapons proliferation
Refers to the spread of weapons, especially in international security contexts.
国際社会は兵器拡散の防止に取り組んでいる。
The international community is working to prevent arms proliferation.
Specifically refers to nuclear proliferation, while 兵器拡散 covers all types of weapons.
Compound of 兵器 (weapons) and 拡散 (diffusion, spread).