Wikipedia
A non-belligerent is a person, a state, or other organization that does not fight in a given conflict. The term is often used to describe a country that does not take part militarily in a war. The status does not exist in international law.
A non- belligerent state differs from a neutral one in that it may support certain belligerenta in a war but is not directly involved in military operations. The term may also be used to describe a person not involved in combat or aggression, especially if combat or aggression is likely. In a situation of civil unrest such as a riot, civilians may be divided into belligerents, those actually fighting or intending to fight, and non-belligerents who are merely bystanders.
Usage examples of "non-belligerent".
Germans, Henry promised Strauss that the United States would support the reunification of Germany, and would devote its best effort to the creation of a neutral zone, an old-fashioned cordon sanitaire, a string of small non-belligerent states between reunified Germany and its dangerous Soviet neighbor.
It must be confessed that there seems some irony in the fact that, within five days of the British ruling by which the Boers were no longer a military force, these non-belligerents had inflicted a loss of nearly six hundred men killed, wounded, or taken.