Related Rule
Poland
Practice Relating to Rule 63. Use of Flags or Military Emblems, Insignia or Uniforms of Neutral or Other States Not Party to the Conflict
Poland’s Penal Code (1997) punishes “any person who, during hostilities, uses … flags or military emblems of a … neutral State … in violation of international law”. 
Poland, Penal Code, 1997, Article 126(2).