North Korea says 'don't mess with us' as U.S. plans next move

By Ju-min ParkSEOUL (Reuters) - Secretary of State Rex Tillerson said the United States was looking at ways to pressure North Korea over its nuclear program as North Korean state media warned the Americans of a "super-mighty preemptive strike" and said don't "mess with us".U.S. President Donald Trump has taken a hard line with North Korean leader Kim Jong Un, who has rebuffed admonitions from sole major ally China and proceeded with nuclear and missile programs in defiance of U.N. Security Counc