While North Korea's call for unification with the South could be interpreted as a step toward reducing tensions, Pyongyang hit several troubling nuclear milestones with unexpected speed in the past year. Tensions between Kim Jong-un and President Donald Trump also ramped up over tweets and statements in an almost dizzying back and forth.
Bottom line: The potential for miscalculation is high. But where exactly does North Korea's nuclear program stand amidst these risks, and where does it fall short? And what about the U.S. capability to defend itself?