履險如夷lǚ xiǎn rú yílit. to make one's way through a dangerous pass as if walking on level ground (idiom); fig. to handle a crisis effortlessly
以夷制夷yǐ yí zhì yíto use foreigners to subdue foreigners (idiom); let the barbarians fight it out among themselves (traditional policy of successive dynasties); Use Western science and technology to counter imperialist encroachment. (late Qing modernizing slogan)