North Korea's ability to attack the US all came from China. Without China's providing the tech, resources and supplies, North Korea couldn't launch a kite. If North Korea do launch, they do so with China's permission. There will never be a war with North Korea and the United States. Never. Not in a billion years. But there might be a war between China/North Korea and the United States. That may yet happen. It happened once already so the possibility is always there.