Related Rule
Ukraine
Practice Relating to Rule 109. Search for, Collection and Evacuation of the Wounded, Sick and Shipwrecked
Ukraine’s IHL Manual (2004) states:
1.4.12. … As soon as the circumstances allow, all parties to an armed conflict shall … take all possible measures to find and gather wounded, sick and shipwrecked or those who suffered an aircraft crash …
2.5.2.1. Both during combat and after the accomplishment of the combat mission the commander of a large or small unit (command) shall take all measures to search for and collect the wounded, sick … and shipwrecked ([or] persons who suffered from an aircraft crash) … regardless of their identity. 
Ukraine, Manual on the Application of IHL Rules, Ministry of Defence, 11 September 2004, §§ 1.4.12 and 2.5.2.1.