Kautilya's Arthashastra 9.7.71

9.7.71

parasparasādhakā hy upāyāḥ //

Success against friends and enemies is always achieved by complicated means; for strategic means help each other. In the case of suspected ministers of an enemy, the employment of conciliation does not need the use of the other means; in the case of treacherous ministers it is by means of gifts; in the case of combination of states, it is by means of sowing the seeds of dissension; and in the case of the powerful, it is by means of coercion.