Related Rule
Russian Federation
Practice Relating to Rule 19. Control during the Execution of Attacks
The Russian Federation’s Regulations on the Application of IHL (2001) states:
No attack shall be launched if it may be expected to cause incidental losses or damage which would be excessive in relation to the anticipated military advantage. It shall be cancelled or stopped as soon as it becomes obvious that collateral losses and damage will be excessive. 
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, § 30.