Judy Woodruff:
But first, staying with the topic of North Korea, since the start of the year, tensions have lowered on the Korean Peninsula.
In the past few weeks, North Koreans participated in the Olympics in South Korea. Kim Jong-un's sister attended the Games, and gave the president of South Korea a letter from her brother, inviting him to North Korea.
And earlier this week, South Korea's President Moon Jae-in North Korean officials told him that the North was willing to have a dialogue with the United States.
So, where do things stand now between North and South, and with the South's American ally?
For that, we turn to Moon Chung-in. He is senior foreign policy and unification adviser to South Korea's president.
Mr. Moon, welcome to the NewsHour.
The Trump administration describes its policy toward North Korea as maximum pressure. You said yesterday that it should be instead maximum prudence. Why? What did you mean?