Related Rule
Ukraine
Practice Relating to Rule 115. Disposal of the Dead
Section D. Burial in individual or collective graves
Ukraine’s IHL Manual (2004) states:
2.5.3.5. The best spaces of open and dry terrain shall be chosen for gravesites and separate graves.
2.5.3.6. As much as possible, the burial of the dead bodies or their remains shall be done individually. 
Ukraine, Manual on the Application of IHL Rules, Ministry of Defence, 11 September 2004, §§ 2.5.3.5 and 2.5.3.6.