North Korea has already made them nuclear weapons power country. Not only that but also at present they have tested hydrogen boom also. Most of the countries in the world are against North Korea except China. Why?
China don't want North Korea to become an American colony, like South Korea and Japan. If North Korea becomes an American colony, then the US troops will be stationed along the mainland China border, and this is something that the Chinese want to avoid at all cost. Xi Jinping is not a big fan of Kim Jong Un, but he is going to tolerate him for a few more years.