North Korea 's artillery barrage was serious , but this is not a crisis , said co - authors . They say the barrage fits pattern of North Korea 's behavior and does n't preclude progress . Revelation of a uranium enrichment plant does n't signal increase in its nuclear capability , they say . Good advice and as relevant as ever for the United States regarding North Korea . 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 , said co - authors . They say the barrage fits pattern of North Korea 's behavior and does n't preclude progress . Revelation of a uranium enrichment plant does n't signal increase in its nuclear capability , they say . U.S. needs to try economic and diplomatic measures to move ahead , they say .