Соответствующая норма
Practice Relating to Rule 46. Orders or Threats That No Quarter Will Be Given
Finland’s Criminal Code (1889), as amended in 2008, provides that any person who “announces that no mercy shall be given … or uses other means of warfare prohibited in international law” shall be “sentenced for a war crime to imprisonment for at least one year or for life”. 
Finland, Criminal Code, 1889, as amended in 2008, Chapter 11, Section 5(1)(13).
(emphasis in original)