Соответствующая норма
Practice Relating to Rule 107. Spies
Section A. Definition of spies
Belgium’s Law of War Manual (1983) defines a spy as:
an individual who gathers or attempts to gather, clandestinely or on false pretences, information in the zone of operations of a belligerent with the intention of communicating it to the adverse party. The “zone of operations” comprises zones where no land operations are taking place but which may be hit by aerial bombardment (including bombardment by long-range missiles). This interpretation is very wide. Neutral territory on which a spy may operate cannot, however, be considered as a “zone of operations”. 
Belgium, Droit Pénal et Disciplinaire Militaire et Droit de la Guerre, Deuxième Partie, Droit de la Guerre, Ecole Royale Militaire, par J. Maes, Chargé de cours, Avocat-général près la Cour Militaire, D/1983/1187/029, 1983, p. 21.