1) The article of Amb. Gregg was written and submitted to the desk on Nov. 25 and published on Jan. 12, which means that it was written prior to the fourth nuclear test conducted by North Korea.
2) This matter has been covered by several news outlets. Amb. Gregg also expressed regret that he didn't foresee North Korea's latest nuclear test, which was also mentioned in several news articles.
Rhyu Sang-young
Editor of the East Asia Foundation Policy Debate