Although Kim Jong Un is a very unreasonable leader and has a firm, unreasonable belief that nuclear and missile weapons will protect him and his regime, we will continue to employ all possible means - sanctions, pressure, as well as dialogue - to draw North Korea to the negotiating table for denuclearization. To resolve the issue, we have to add dialogue to the current menu of sanctions and pressure.

For now we must continue to strengthen our sanctions and pressure on North Korea.

When it comes to dialogue between South and North Korea and between the United States and North Korea, these can go on parallel tracks. South Korea and the United States can each play a role.

Trump has put the resolution of the North Korean nuclear issue at the top of his priority list, and he has employed a tactic of maximum pressure and engagement, but engagement can only occur if the conditions are right.

The message that we must send to North Korea is twofold: If the North Korean regime believes that it can defend and protect itself through nuclear and missile programs, that is a misjudgment. But if North Korea gives up its nuclear program, we will help it secure and develop itself. We must consistently send these two messages.

Kim Jong Un is an unreasonable leader and a very dangerous person. Yet he is the person who has effective control over North Korea, and he is the person who has the authority to denuclearize North Korea.

It is very deplorable that North Korea still does not uphold human rights, which are universal values.