Is it ensure, insure, or assure?
the condition of being in fact engaged in war. A nation is deemed a belligerent even when resorting to war in order to withstand or punish an aggressor. A declaration of war is not necessary to create a state of belligerency. For example, the United States and the People's Republic of China were belligerents during the Korean conflict, though both parties avoided characterizing the hostilities as war.