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The North’s threat is “regrettable,” Mr. Kim told reporters. “We will thoroughly and resolutely punish North Korea if it launches any provocation for whatever reason.”

South Korean Defense Minister Kim Kwan-jin told a parliamentary committee Monday that North Korea still appears poised to launch a missile from its east coast. To further coordinate a response, South Korea’s new president, Park Geun-hye, will meet with Mr. Obama on May 7 at the White House.

State Department spokesman Patrick Ventrell said the United States is open to dialogue with North Korea but only if Pyongyang proves itself to be trustworthy.

“The burden remains on Pyongyang,” Mr. Ventrell said. “They need to take meaningful steps to show that they’ll honor their commitments. We need to see them be serious about denuclearization, indicate their seriousness, and start to reduce the threats and stop provocations.”