Related Rule
Practice Relating to Rule 161. International Cooperation in Criminal Proceedings
Section B. Extradition
Ukraine’s IHL Manual (2004) states:
Each State shall be under the obligation to search for persons who have committed, or to have ordered to be committed, war crimes (including those crimes that were a result of a failure to take precautionary measures that had to be taken).
Any person charged with such crimes shall be handed over to a requesting State unless that person was brought to justice for serious violations of international humanitarian law in its own State. 
Ukraine, Manual on the Application of IHL Rules, Ministry of Defence, 11 September 2004, § 1.8.9.