Related Rule
Russian Federation
Practice Relating to Rule 45. Causing Serious Damage to the Natural Environment
Section B. Environmental modification techniques
The Russian Federation’s Military Manual (1990) states that “substances which have widespread, long-term and severe consequences on the environment” are prohibited means of warfare, referring in particular to the 1976 ENMOD Convention. 
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(g).
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: … environmental modification techniques having widespread, long-lasting or severe effects as the means of destruction, damage or injury. 
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.