相关规则
Japan
Practice Relating to Rule 107. Spies
Japan’s Law concerning the Treatment of Prisoners of War and Other Detainees in Armed Attack Situations (2004) states that a “Person subject to internment” means a “foreigner” who falls under certain specified categories, including: “Member of enemy armed forces, etc. who may be treated as spy pursuant to the provision of Article 46 of the First Additional Protocol [1977 Additional Protocol I]”. 
Japan, Law concerning the Treatment of Prisoners of War and Other Detainees in Armed Attack Situations, 2004, Article 3(iv)(j).