Kautilya's Arthashastra 9.6.26

9.6.26

parasparadveṣavairabhūmiharaṇaśaṅkitam ato 'nyatamena bhedayet //

When any two kings are apprehensive of enmity and seizure of land from each other, seeds of dissension may be sown between them. The timid of the two may be threatened with destruction and may be told: "Having made peace with you, this king works against you; the friend of this other king is permitted to make an open peace."