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North Korea’s actions have created an environment where it is harder for the other parties to reach out to Pyongyang, said Scott Snyder, director of the Program on U.S.-Korea Policy at the Council on Foreign Relations.

“More significantly, North Korea’s actions are signaling a lack of readiness on North Korea’s part for that kind of dialogue in the first place,” Mr. Snyder said. “Unless the North Koreans signal a willingness themselves to engage in diplomacy and dialogue, it is really besides the point whether President Obama or [South Korean] President-elect Park [Geun-hye] might want that dialogue.”