After the Manchurian Incident, the Japan-Manchukuo bloc theory aiming at a comprehensive cooperative relation between the countries over military affairs and economy, etc. was being argued and policized in Japan as a diplomatic theory plan. Ryutaro Nagai, a pre-war politician, was a typical character who had advocated the diplomatic design at this time. Nagai changed the appeasing posture to China with the Manchurian Incident and acknowledged the incident, and advocated the bloc theory and promoted the realization as a minister for the Colonial Department. When Nagai's Japan-Manchukuo bloc theory was considered, there was a consciousness that Japan and Manchukuo had various common denominators, and there was an affinity among the countries of same "Asia" while at the same time there was a hostile consciousness to Europe and America, and the white races that existed there. Moreover, although Nagai developed the Manchukuo development theory which is also a part of a Japan-Manchukuo bloc, one of the purposes of this was that he was improving the invitation conditions on which China was added to a Japan-Manchukuo bloc, and realizing Japan-Manchukuo-China bloc organization. Nagai held an idea that the outlook on the world that Japan and China were countries where various common denominators existed, and that cooperating as the same Asia and nonwhite races was inevitable.
