相关规则
Croatia
Practice Relating to Rule 8. Definition of Military Objectives
Section D. Weapons and weapon systems
Croatia’s LOAC Compendium (1991) states that proper targets in the air include “enemy military aircraft violating national airspace or flying over the high seas”. 
Croatia, Compendium “Law of Armed Conflicts”, Republic of Croatia, Ministry of Defence, 1991, p. 44.