Hwasong-14 intercontinental ballistic missile

In this July 4, 2017, file photo distributed by the North Korean government, North Korean leader Kim Jong Un, second from right, inspects the preparation of the launch of a Hwasong-14 intercontinental ballistic missile (ICBM) in North Korea's northwest. North Korea on Thursday, Dec. 20, 2018, says it will never unilaterally give up its nuclear weapons unless the United States removes its nuclear threat first.

(Korean Central News Agency/Korea News Service via AP, File)