Automated border defenses, both lethal and nonlethal. Weapons that are technically not lethal, but make the victim wish they were (bonus points if the weapon doesn't leave any external marks on the victim to prevent media backlash). Weapons and procedures for destroying damns with minimal damage to your own country that lies downstream. Hypertargeted cloudseeding, to make sure it rains on your fields instead of your neighbors'.

So many new opportunities for psychopaths to earn lots and lots of money.