YOU SAID:

friends are not friends if they're friends with the enemy

INTO JAPANESE

彼らは敵と友達なら友達は友達ではありません。

BACK INTO ENGLISH

They are enemies with friends friends friend is not.

INTO JAPANESE

友人の友人の友人がいないと敵がいます。

BACK INTO ENGLISH

Friend of a friend is not the enemy.

INTO JAPANESE

友人の友人は、敵ではないです。

BACK INTO ENGLISH

Friend of a friend is not the enemy.