A bonafide alliance must necessarily entail sometimes acting faithfully even to the detriment of one's interests. If the 'allies' are only faithful and only be

A bonafide alliance must necessarily entail sometimes acting faithfully even to the detriment of one's interests. If the 'allies' are only faithful and only believe each other until the moment that threshold is crossed then it's just regular diplomatic relations. e.g. Nearly every country cooperates with nearly every other country on such terms in the areas where they share bonafide mutual interests.