North Korea 's artillery barrage was serious , but this is not a crisis , say co-authors . They say the action fits pattern of North Korea 's behavior and does n't preclude progress . Comment: U.S. needs to try economic and diplomatic measures to move ahead , they say .
North Korea 's artillery barrage was serious , but this is not a crisis , say co-authors . They say the action fits pattern of North Korea 's behavior and does n't preclude progress . Revelation of a uranium enrichment plant does n't signal escalation in its weapons capability , they say . U.S. needs to try economic and diplomatic measures to move ahead , they say .