Pyongyang sees the nuclear crisis as a U.S.-North Korea issue, Delury said.
NPR: SKorea's New Leader Faces NKorea Nuke Crisis
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There are military options for South Korea beyond firing missiles, said John Delury, who studies North and South Korea at the Asia Society.
CNN: STORY HIGHLIGHTS
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Anything combative would hurt South Korea economically, Delury said, but the country could increase its naval presence along the line that divides South and North Korea in the waters surrounding the countries.