Règle correspondante
Japan
Practice Relating to Rule 139. Respect for International Humanitarian Law
Japan’s Law concerning the Peace and Independence of the Nation and National Security in Situations of Armed Attack (2003) states:
Article 21 – Basic Plans on the Preparation of Legislation relating to the Response to Situations [of Armed Attack]
2. [All such] legislation must ensure the appropriate implementation of international humanitarian law applicable in international armed conflict. 
Japan, Law concerning the Peace and Independence of the Nation and National Security in Situations of Armed Attack, 2003, Article 21(2).