“North Korea’s weapons capabilities have shown a ‘qualitative improvement’ in the past year, the No. 2 U.S. diplomat said Thursday. Deputy Secretary of State Antony Blinken, who met with his counterparts from key U.S. allies Japan and South Korea, said the North conducted nuclear and missile tests with unprecedented intensity during 2016 and that the threat it poses grows by the day. The North Koreans learn from every single test, including failures, he said.”
Source: U.S. sees ‘qualitative improvement’ in North Korea capability