Belligerent

A belligerent (lat. bellum gerere, "to wage war") is an individual, group, country or other entity which acts in a hostile manner, such as engaging in combat. Belligerent comes from Latin, literally meaning "They (should) wage war." Unlike the colloquial use of belligerent to mean aggressive, its formal use does not necessarily imply that the belligerent country is an aggressor.