war of aggression

noun

1. A military conflict waged without the justification of self-defense, usually for territorial gain and subjugation.

   “The crime of war, the crime of the war of aggression, and the crime of aggression are clearly three different crimes with three different facts of the case. For a complex judgment of war, they nonetheless overlap with one another, and their separation seems to a large section of public opinion a mere juridical artifice.”