Introduction
In the next four years, North Korea is poised to cross a dangerous threshold by finally developing the capability to hit the continental United States with a nuclear missile. That ability would present a direct threat to the United States and could punch a hole in the U.S. nuclear umbrella in Asia: Japan and South Korea, doubtful that Washington would risk U.S. cities to defend Tokyo or Seoul, might feel they had no choice but to get their own nuclear bombs. U.S. President Donald Trump, while still president-elect, drew a redline at Pyongyang’s feet, tweeting, “It won’t happen!” But the real question is how to stop it.
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