Règle correspondante
Practice Relating to Rule 77. Expanding Bullets
Ukraine’s IHL Manual (2004) states that the use as a means of warfare of “bullets which expand or flatten easily in the human body (bullets with a hard envelope which does not cover the core entirely or is pierced with incisions)” is prohibited. 
Ukraine, Manual on the Application of IHL Rules, Ministry of Defence, 11 September 2004, § 1.3.3.