On January 15, Kim Jong Un formally declared South Korea to be an enemy state. This is significant for the fact that since the end of the Korean War, the line from Pyongyang was more or less that South Korea was like a wayward relative and would ultimately be reunified with the North. But now, according to Kim and changes he's enacting to the North Korean constitution, the state of South Korea is Enemy Number 1. This policy shift comes amidst several geopolitical trends that combined suggests to some longtime North Korea watchers that Kim is readying for war.

On the line with me to explain the significance of this official change in North Korea's policy towards South Korea, why this change is happening now, and what can be done to deter of constrain Kim Jong Un, is Sue Mi Terry. She is a former CIA analyst, long time North Korea expert and producer of the new documentary about North Korea called Beyond Utopia, which was just nominated for a BAFTA for best documentary.

Read Sue Mi Terry in Foreign Affairs