Related Rule
Russian Federation
Practice Relating to Rule 77. Expanding Bullets
The Russian Federation’s Military Manual (1990) prohibits the use of various weapons that cause unnecessary suffering, including “bullets that expand or flatten easily in the human body”. 
Russian Federation, Instructions on the Application of the Rules of International Humanitarian Law by the Armed Forces of the USSR, Appendix to Order of the USSR Defence Minister No. 75, 1990, § 6(a).
The Russian Federation’s Regulations on the Application of IHL (2001) states: “The following shall be prohibited to use in the course of combat operations: … bullets which expand or flatten easily in the human body, both specially manufactured or modified to cause such an effect later on.” 
Russian Federation, Regulations on the Application of International Humanitarian Law by the Armed Forces of the Russian Federation, Ministry of Defence of the Russian Federation, Moscow, 8 August 2001, § 9.