यावदुपकरोति तावन्मित्रं भवति उपकारलक्षणं मित्रमिति ॥ कZ_०७.९.१२ ॥
yāvad upakaroti tāvan mitraṃ bhavati upakāralakṣaṇaṃ mitram iti
One remains a friend only so long as one provides assistance; friendship is defined by beneficial service.
Alliances should be evaluated by deliverables—aid, resources, restraint—not by sentiment; when assistance stops, the relationship must be renegotiated or replaced.