महादोषो हि विशिष्टबलसमागमो राज्ञामन्यत्रारिविगृहीतात् ॥ कZ_०७.२.०८ ॥
mahādoṣo hi viśiṣṭabalasamāgamo rājñām anyatrārivigṛhītāt
For kings, joining with a markedly superior force is a grave fault—except when one has already been seized/subdued by the enemy.
Because it invites domination and dependency; the stronger ally can dictate terms, absorb resources, or neutralize the weaker king’s autonomy.