Соответствующая норма
Sweden
Practice Relating to Rule 65. Perfidy
Section J. Simulation of protected status by using flags or military emblems, insignia or uniforms of neutral or other States not party to the conflict
Sweden’s IHL Manual (1991) considers as an example of perfidious conduct “the feigning of protected status … of a member of the armed forces of a neutral state”. 
Sweden, International Humanitarian Law in Armed Conflict, with reference to the Swedish Total Defence System, Swedish Ministry of Defence, January 1991, Section 3.2.1.1.b, p. 29.