noun
right of belligerency
Legal term referring to the right of a state to engage in war under international law. Often discussed in the context of Japan's constitutional renunciation of war.
日本国憲法は交戦権を否認している。
The Constitution of Japan renounces the right of belligerency.
Compound of 交戦 (kōsen, 'hostilities') + 権 (ken, 'right'). The term is a modern legal coinage used in international law and constitutional discourse.