Warlike, aggressive, quarrelsome.
Example:
The country often elected the more bellicose party after a period of tension along the border, hoping that military action would result.
The international relations of a nation with a bellicose foreign policy tend to be stormy and difficult, since such a nation looks for opportunities to fight rather than to negotiate. Combative by nature, it is happiest when quarreling or, better yet, actively engaged in battle.