Answer: the same president who allowed N. Korea to continue building a nuclear arsenal and detonate a test nuke, and who went to the U.N., (of all places), to ask for a wrist slap on North Korea, and then begged China to stop NK from detonating yet another nuke because he felt the cost of stopping NK himself would be too expensive politically and militarily.
As for China's alleged 'reigning in' of North Korea, do you really think it will be lasting, or even that it's real? So I have a quiz question for you:
"What would have been better, the U.S. bombing North Korea's nuclear arsenal and setting them back at least ten years or more, or China "talking" with their Communist friends in private and claiming that they have 'sovled' the problem?"
The latter, so far.