Related Rule
Russian Federation
Practice Relating to Rule 17. Choice of Means and Methods of Warfare
The Russian Federation’s Regulations on the Application of IHL (2001) states:
Whenever there is a choice between several means and methods of engaging the enemy by fire, or between types of fire, for getting equal results preference is given to those means and methods … that pose the least danger to the civilian population and objects. 
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, § 21; see also § 29.