Related Rule
Russian Federation
Practice Relating to Rule 12. Definition of Indiscriminate Attacks
Section C. Attacks whose effects cannot be limited as required by international humanitarian law
The Russian Federation’s Regulations on the Application of IHL (2001) states:
Indiscriminate attacks are … those which employ a method or means of combat which … cannot ensure the required limitation of their effect and the respect of the principle of distinction. 
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, § 54.