Related Rule
Russian Federation
Practice relating to Rule 66. Non-Hostile Contacts between the Parties to the Conflict
Section D. Refusal to receive parlementaires
The Russian Federation’s Regulations on the Application of IHL (2001) states:
Refusal to enter into negotiations with the enemy does not violate international humanitarian law, however in any case the commander shall ensure the inviolability of the parlementaire and the persons who accompany him. 
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, § 67.