How the US could respond to North Korea's nuclear threat

Experts weigh in on a possible US reaction to North Korea’s successful intercontinental ballistic missile test, from further sanctions to diplomacyA US MGM-140 army tactical missile is fired during the combined military exercise between the US and South Korea against North Korea on Wednesday. Photograph: AP
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Public urgency about the threat of North Korea developing a reliable long-range nuclear weapon capable of striking the US was sharpened by news of what Pyongyang and outside analys