以夷制夷 [ㄧˇ ㄧˊ ㄓˋ ㄧˊ; yi3 yi2 zhi4 yi2]
to use foreigners to subdue foreigners (idiom); let the barbarians fight it out among themselves (traditional policy of successive dynasties)
To use western science and technology to counter imperialist encroachment (late Qing modernizing slogan).
◄ ►