On July 28th, 2023, a book titled World History 22: The Cold War and Decolonization I, which has a chapter titled “The History of the Cold War as International Relations History” written by Professor Toshihiko Aono of the Graduate School of Law, was published from Iwanami Shoten. In this chapter, Professor Aono refers not only to the conventional understanding of the Cold War as a conflict between two camps – East and West – over security and ideology, but also to the fact that it is being studied as an “international relations history” based on the interrelationships between various states and political entities with different national strengths and ideologies. Then, he explains on the formation process, form and differences in functionality of the East and West blocs and discussed how the Cold War affected the decolonization of dependent countries, while also explaining the responses of Third World countries. He also mentions nuclear capabilities and détente, referring to the wavering of confidence in extended deterrence with allies as well as nuclear deterrence between the US and the Soviet Union, and explains the development and limitations of détente between the US, China and the Soviet Union. He also discusses the fact that the factors that led to the end of the Cold War are now being re-examined as a complex process involving multiple countries, not just the US and the Soviet Union. In conclusion, he points out that the end of the Cold War occurred at different times and in different regions and discussed the need to understand the history of the Cold War in a complex way, taking into account the fact that people around the world were exposed to constant “violence”.