Related Rule
Practice Relating to Rule 37. Open Towns and Non-Defended Localities
Section C. Attacks on open towns and non-defended localities
Ukraine’s IHL Manual (2004) states: “Attacks against or hostilities within non-defended localities … shall be prohibited”. 
Ukraine, Manual on the Application of IHL Rules, Ministry of Defence, 11 September 2004, § 1.2.50; see also §§ 1.2.51 and 1.8.5