Which they exactly did: North Korea’s Hydrogen Bomb Claim Strains Ties With China JAN. 6, 2016 https://www.nytimes.com/2016/01/07/world/asia/north-korea-chin

Which they exactly did: North Korea’s Hydrogen Bomb Claim Strains Ties With China JAN. 6, 2016 https://www.nytimes.com/2016/01/07/world/asia/north-korea-china-hydrogen-test.html https://www.nytimes.com/2016/01/07/world/asia/north-korea-ch... China announces sanctions against North Korea 5 April 2016 http://www.independent.co.uk/news/world/asia/china-announces-sanctions-against-north-korea-a6969256.html http://www.independent.co.uk/news/world/asia/china-announces...