Commentary: Nuclear weapons are illegal Special to The Enterprise On Jan. 22, the Treaty on the Prohibition of Nuclear Weapons enters into force and becomes part of the canon of international law, after it was ratified by the required 50 states. According to Article 1 of the Treaty, states party to the Treaty are prohibited under any circumstances from any of the following activities: (a) Develop, test, produce, manufacture, otherwise acquire, possess or stockpile nuclear weapons or other nuclear explosive devices; (b) Transfer to any recipient whatsoever nuclear weapons or other nuclear expl...