So the question we have to ask ourselves in 2017 is: Why does North Korea risk its long-enjoyed security by developing long-range nukes? Why is it doing the one thing that might force America to attack, to accept even the likelihood of South Korean civilian casualties? And the only goal, the only plausible goal big enough to warrant the growing risk and expense is the goal North Korea has been pursuing from day one of its existence? And I can ask you Matthew what that goal is; I'm sure you know. It's the unification of the peninsula. More concretely, North Korea wants to force Washington into a grand bargain linking de-nuclearization to the withdrawal of U.S. troops. South Korea would then be pressured into a North-South confederation, which is a concept the South Korean left has flirted with for years, and which the North has always seen as a transition to unification under its own control.