The North Korean nuclear crisis is severe, with North Korea having developed missiles potentially armed with nuclear weapons that can reach the continental US. However, the international response has mainly been ineffective in stopping North Korea. Additionally, South Korea’s new attitude going towards negotiation with North Korea is an important game-changer. Through this research, I plan to explore the questions of why the international sanctions have been ineffective, how South Korea’s changing attitude can influence this issue, and what can be done to solve this issue completely. For this research, I have collected information from many sources both from the US and in Korea, including books, journals, and newspapers. Some of my findings are that there are loopholes to the sanctions, especially China not enforcing the sanctions and trading key goods with North Korea, especially oil. Additionally, the Moon Jae-In administration’s new strategy towards the issue, going more towards negotiation, may be catastrophic and must stop immediately. To solve this issue, South Korea must stop doing peace talks with North Korea, as such talks were catastrophic during the past, and stay on the same page with the US to motivate China from not trading with North Korea, especially oil which is crucial to its survival, as North Korea cannot produce its own oil. This may be enough to force North Korea to denuclearize. A better solution is to assassinate the dictator of North Korea, Kim Jong Un, which will lead to disorder in North Korea as Kim Jong Un does not have a successor currently, and South Korea and the US can use this opportunity to destroy the weapons of mass destruction in North Korea. This research is crucial for maintaining the peace and security not only in the East Asia region, but also for the entire world.