I want to know the answer to the following question:
How does the United States view North Korea's threats?
All the background I'm provided with is that "Speaking on 4 April 2013, the U.S. Secretary of Defense, Chuck Hagel, informed the press that Pyongyang had "formally informed" the Pentagon that it had "ratified" the potential usage of a nuclear weapon against South Korea, Japan and the United States of America, including Guam and Hawaii.". Is that enough to answer the question?