With diplomacy dead, the United States and South Korea are scrambling to shore up deterrence through regular military drills. Last year, the United States deployed a nuclear-armed submarine to South Korea for the first time since the 1980s. Mr. Kim has responded with yet another round of threatening maneuvers, testing a solid-fueled ballistic missile and experimenting with a nuclear-capable undersea unmanned vessel.
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Members of the Editorial Board: Opinion Editor David Shipley, Deputy Opinion Editor Charles Lane and Deputy Opinion Editor Stephen Stromberg, as well as writers Mary Duenwald, Shadi Hamid, David E. Hoffman, James Hohmann, Heather Long, Mili Mitra, Eduardo Porter, Keith B. Richburg and Molly Roberts.