Related Rule
Russian Federation
Practice Relating to Rule 63. Use of Flags or Military Emblems, Insignia or Uniforms of Neutral or Other States Not Party to the Conflict
The Russian Federation’s Military Manual (1990) considers that the improper use of national signals and flags 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(c).
The Russian Federation’s Regulations on the Application of IHL (2001) states: “When organizing and conducting cover and concealment of military objectives it is prohibited to make use of … the flags, military emblems and uniforms of … neutral states.” 
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, § 137.