Viet Nam
Practice Relating to the Use of Prohibited Weapons
Viet Nam’s Penal Code (1990) punishes “anyone who, in time of war, … uses prohibited means or methods of warfare”. 
Viet Nam, Penal Code, 1990, Article 279.
Viet Nam’s Penal Code (1999) provides for the punishment of those “who, in time of peace or time of war, undertake … the use of prohibited means or methods of warfare”. 
Viet Nam, Penal Code, 1999, § 343.