Related Rule
Ukraine
Practice Relating to Rule 13. Area Bombardment
Ukraine’s IHL Manual (2004) states:
It is prohibited to attack as a single target (objective) several clearly separated and distinct military objectives located in a city, village or other area containing a concentration of persons and objects protected by international humanitarian law. 
Ukraine, Manual on the Application of IHL Rules, Ministry of Defence, 11 September 2004, § 2.4.2.