Related Rule
Russian Federation
Practice Relating to Rule 46. Orders or Threats That No Quarter Will Be Given
The Russian Federation’s Military Manual (1990) states that “ordering that there shall be no survivors, threatening the adversary therewith or conducting the hostilities according to this decision” is a prohibited method of warfare. 
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, § 5(p).
The Russian Federation’s Regulations on the Application of IHL (2001) states: “The prohibited methods of warfare include … ordering that there shall be no survivors, threatening therewith or conducting hostilities on this basis.” 
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, § 7.
With regard to internal armed conflict, the Regulations states: “It is prohibited to order that there shall be no survivors.” 
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, § 81.