An act of aggression by belligerent non-state actors. These are bandits. Geneva and Hague Conventions do not apply.
Hunt them all down, kill them & their relatives, freeze & confiscate their assets, burn/bomb/destroy their properties & goods. Not just the shooters, but their cartel and their buddies’ cartels.
Now.
So that the 10th generation from now will tremble at night whenever any mechanized vehicle passes by.
If they would put up a few predator drones and use them I’m sure we could slow down the production and distribution