तस्माद्बाह्येषूपजपत्सु भेददण्डौ प्रयुञ्जीत ॥ कZ_०९.५.२० ॥
tasmād bāhyeṣu upajapatsu bhedadaṇḍau prayuñjīta
Therefore, when outsiders are engaged in instigation, one should employ division and punishment.
Outsiders can be fragmented (break coordination) and deterred or removed through coercive enforcement without the political costs of heavy-handed measures against core insiders.
Disrupt alliances, create mistrust, split leadership, and sever communication channels among external hostile networks.