It's actually Chinese scientists who are making hydrogen bombs in North Korea. North Korea is not capable of developing such technology. If North Korea was able to make such bombs then Shri Lanka, Nepal, malacia, Vietnam, phillipines, Pakistan, turkey, Lebanon, everybody will be doing it. China will continue to smuggle oil to North Korea through the border regardless of any UN sanctions. China will backstab US if a war breaks out in between US and North Korea(Believe it or not)