कृतार्थश्च शत्रुर्वैगुण्यमेति ॥ कZ_०७.८.१९ ॥
kṛtārthaś ca śatrur vaiguṇyam eti
And an enemy, once his objective is achieved, lapses into unreliability/defectiveness.
The credible-commitment problem: an adversary’s promises are least reliable once they have secured their immediate goals.
Do not structure security around an enemy’s assurances; lock cooperation (if any) with enforceable leverage, timelines, and exit options.