Related Rule
Practice Relating to Rule 45. Causing Serious Damage to the Natural Environment
Section A. Widespread, long-term and severe damage
Ukraine’s IHL Manual (2004) states:
1.3.1. Prohibitions and limitations on the choice of methods and means of warfare for the belligerents are set forth in order to avoid [the] …infliction of severe and long-term damage to the natural environment related to warfare.
1.3.3. The following means of warfare are prohibited:
- influencing the environment so as to cause long-term severe damage. 
Ukraine, Manual on the Application of IHL Rules, Ministry of Defence, 11 September 2004, §§ 1.3.1–1.3.3.
Under Ukraine’s Criminal Code (2001), “ecocide”, namely “mass destruction of flora and fauna, poisoning of air or water resources, and any other acts that may cause an ecological disaster”, constitutes a criminal offence. 
Ukraine, Criminal Code, 2001, Article 441.
In its written statement submitted to the ICJ in the Nuclear Weapons (WHO) case in 1994, Ukraine stated that it was “deeply convinced that, in view of the health and environmental effects, the use of nuclear weapons by a State in war or other armed conflict would be a breach of its obligation under international law”. 
Ukraine, Written statement submitted to the ICJ, Nuclear Weapons (WHO) case, 16 May 1994, p. 1.