Related Rule
Russian Federation
Practice Relating to Rule 64. Conclusion of an Agreement to Suspend Combat with the Intention of Attacking by Surprise the Adversary Relying on It
The Russian Federation’s Regulations on the Application of IHL (2001) states: “The use of the armistice agreement to inflict destruction (to rout) the enemy is considered as perfidy.” 
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, § 70.