Asia Weighs Risk of Sanctions.

Ralph Cossa, president of the Pacific Forum CSIS think tank in Honolulu, an arm of the Center for Strategic and International Studies, said other countries have tolerated North Korea because the cost of ousting Mr. Kim and rebuilding the country has been perceived to be too high.

"But if the cost of not having regime change is having it as a demonstrated nuclear state, then maybe that cost is too high," he said. "It's got to be the Chinese and South Koreans who say enough is enough."

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