US South Korea Kunsan F-16 elephant walk
US and South Korean air force taxi down a runway during an exercise at Kunsan Air Base in South Korea on March 2, 2012.
  • The US and South Korea will simulate a nuclear crisis for a tabletop exercise next week.
  • The exercise will come just days after North Korea's government issues its latest threats.
  • North Korea threatened "unprecedentedly" strong action Friday as the US and South Korea plan large field exercises.

The US and South Korea will simulate a nuclear crisis in a tabletop exercise next week, just days after North Korea's latest threat of "unprecedentedly" strong actions against the countries.