认敌为友 Origin — Chinese Character Wiki

rèndíwéiyǒu

to treat an enemy as a friend

认認 rèn verb

to mistake for

to regard or mistake as; to take something for
敌敵 dí noun

enemy

(bound form) enemy; foe; a person or group that is hostile toward another
为為 wéi verbpreposition

to be

to be; to become; to act as; to serve as; to take as
友 yǒu noun

friend

(bound form) friend; companion; associate; partner