China & North Korea: Ever wonder?

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I'm sure that North Korea's nuclear capabilities, or at least, desired capabilities, is known all around the world. It also seems that they have been threatening to attack South Korea, & possibly Japan if those two countries interfere with their ambitions. They have also tested out various rockets/missiles, to the chagrin of much of the rest of the world. Keep in mind that those nuclear tests were awfully close to border of China. yet, it can be said that it is because China is North Korea's staunchest ally, that they're not concerned. So far, when the other nations of the world want to impose sanctions, the government of China, & quite often, Russia's government, quite often blocks them from passing, or proverbially waters it down. Maybe I'm just being a conspiracy theorist, but is the North Korean situation possibly some sinister plan that the Chinese government has? Even though the Egyptians & Mesopotamians seemed to have their own form of paper, the Chinese had it as well. As Marco Polo discovered, the Chinese also had paper currency that is widely used today. Militarily, they also had advances there, such as the first flame thrower & gunpowder. Even though gunpowder was primarily used in fireworks, the first fire-arm was also traced back to the Chinese. I'm pretty sure there are many other things that I'm not thinking of also. I'm pretty sure if for some reason, China got into a conventional war against North Korea (I doubt it would happen, because of their alliance with them.), by the time the news got around the world, the war would have allready been won by the Chinese military. It also seems that China's anti-missile system is rudimentary as compared to Japan's. Keeping in mind that there was a lot of friction between China & the USSR during the Cold War era, & now, with North Korea developing advanced missiles/rockets, I wonder if it is a lack of concern about North Korea's actions as an ally, or if there is something else that we just don't know about. I wonder what people think. I would also love to hear from people residing in Vietnam, Cambodia, the Philippines, Singapore, Malaysia, & other southeastern countries as well as New Zealand & Austrailia. Also, if there is anyone living In Japan or South Korea as well, & especially anyone living in China. It seems that if they actually have the means to launch a missile that can reach the United States, I'm sure that they can reach the countires I named, as well as those others in the areas that i may have left out. Do you prefer mashed potatoes or Smashed potatoes?