Pentagon now view North Korea as the biggest threat to the security of United States, having conducted about 14 missile tests in this year alone, and openly threatening the United States of nuclear attack. North Korea’s threat is in response to the US’s threat of military action against North Korea’s missile and nuclear tests. The US administrations from Obama to Trump, have committed a series of mistakes on containing North Korea. A series of sanctions for the past one decade has led North Korea to face severe economic crisis, and forced it to the wedge of “feeling nothing more to loss”, but to fight back by any means. North Korea has the backing of China, and Russia. As China is reluctant to abandon its age-old ally, just to please the United States for some economic gains. Another bricking point is that, China doesn’t like US forces on its doorsteps, as it has already complained about the deployment of THAAD missile defense system in South Korea. South China Sea