Why has President Obama developed and continued such a doomed-to-fail North Korea policy? It is only because he has a mindset and logic similar to Mr. Trump's. What is that then? The laundry list could be quite long:

No.1: North Korean leaders are "madmen", thus not rational. Really? Most North Korea observers and those American officials who were involved in the negotiations with North Koreans in 1990s would disagree on this.

No.2: North Koreans are not trustworthy, and they do not observe deals reached by negotiations. Let us be fair. North Korea implemented most of those obligations required in the 1994 Agreed Framework, while American's performance is really questionable due to domestic political fights. North Korea's uranium enrichment program may have violated the spirit of that deal, but literally it implemented its commitment seriously.

No. 3: North Korea, under internal and external pressure, may collapse. Similar poor judgments have misguided American policy toward North Korea for quite a long time. There were several natural disasters in last two decades and two leadership transitions and associated power shifts, and the country's internal hardship is further exacerbated by sanctions imposed on it. However, North Korea survived, sometimes survived well, from those challenges.

No. 4: The Six Party Talks cannot work. Six Party Talks might not be efficient and effective enough to get the nuclear issue solved overnight; however, there was only one nuclear test and very limited missile tests in the duration of the talk. This platform may not be perfect, but if any long-lasting and comprehensive solution is to be reached, the Six Party Talks represent the most indispensable platform.

No. 5: The North Korea nuclear issue is China's problem and China's fault, and China has leverage necessary to solve this problem. No country in Northeast Asia would be better off with a nuclearized North Korea. However, China never ever encouraged or supported North Korea's efforts to develop Weapons of Mass Destruction. China has tried every efforts possible to promote a diplomatic solution, support United Nation statements and resolutions, doing the diplomatic job privately and publicly. China has done more than could reasonably be expected — why ask for more?

A policy based on poor judgment and logic will get nowhere, and an approach that has failed in dealing with North Korea in the past is not going to succeed after the latest test.