U.S. & South Korea’s Security Advisers Discuss N. Korea

South Korea's Presidential office said that South Korea's Chief of National Security and his U.S. Counterpart reaffirmed close cooperation on North Korean issues.

They both had a telephone conversation to discuss North Korea

U.S. President Donald Trump warned North Korea again not to strike Guam or U.S. Allies.
After North Korea disclosed plans to fire missiles over Japan to land near the U.S. Pacific territory of Guam.

Trump further said that the move would prompt "An event the likes of which nobody's seen before."