1921July, Isoroku Yamamoto ended his study life in the United States and returned to Japan. At first, Yamamoto was appointed as the vice captain of the "Northbound" warship, sailing along the coast of China, and Xuan was appointed as an instructor of the Naval University, teaching military and political science. During more than a year as an instructor at the Naval University, Isoroku Yamamoto was able to get rid of the hard life at sea and digest the gains of his trip to the United States. But the naval authorities didn't give him much time. 1in July, 923, after the Washington meeting, he was ordered to inspect the current situation in Europe and America and set foot on the road to Europe.
After visiting Europe, Isoroku Yamamoto came to the United States to inspect the armament of the US Navy and the Japanese-invested Orange Oil Field. After returning home, he urged Japanese oil companies to enter the United States to develop oil fields. As a university officer, his long-term overseas life has enriched his life and vision, made him pay more attention to all aspects of world military technology, and finally made him embark on a military aviation career dedicated to it.
1September 7, 934, Isoroku Yamamoto was appointed as the chief representative of the Japanese navy at the preparatory meeting of the London Naval Disarmament Conference. Isoroku Yamamoto's trip to London was nothing more than the Japanese ruling clique's use of "tenacious Yamamoto" to fool and deceive Britain and the United States, because they expected Yamamoto to enable Japan to achieve the goal of abolishing the treaty without having to bear the adverse pressure of public opinion and morality.
Isoroku Yamamoto's superb skills at the negotiating table won unanimous applause from fascists at home and abroad. After returning home, the Japanese naval authorities also held a report meeting for him. Through disarmament negotiations and negotiations, Isoroku Yamamoto is very clear about the development of the world navy. He believes that Japan's national strength is far from that of the United States at that time, and it is impossible to get involved in unrestricted shipbuilding competition with the United States. In a letter to a friend, he wrote: "There is no denying that the national strength of our empire is far from that of the United States. We deeply feel that it is time for the Japanese Empire to be cautious and self-respecting and strive for strength. It is conceivable that Germany before World War I, if it endures for another 50 years, can compete with today's equally powerful countries. The lessons of the past are the lessons of the future. Today, we Japanese Empire must remain calm and self-respecting. Accumulate strength and make the country strong. Although there is no victory in this negotiation, as long as we can clearly understand the above points and put them into practice, we will not worry that Britain and the United States will fall under our command. "
Finally, he said confidently, "For the navy, it is also very important to be cautious and self-respecting, and work hard. It is imperative to develop maritime aviation quickly anyway. " Vice admiral Isoroku Yamamoto, who has just been promoted at the preparatory meeting of the London Disarmament Conference, has become a worldwide fascist and a household name in Japan.