From Rising Sun And Tumbling Bear, by R. M. Connaughton (Orion, 2020), Kindle pp. 389-390:
Britain and the United States grew apprehensive as to Japanese aspirations. Their mutual suspicions were confirmed when, in 1915, Japan issued China with her notorious 21 Demands, a plan for the annexation of China. Japan was blocked for the time being, but there was reflection as to how long she could be kept down….
It had been in 1918 that a combined force which had included British, American and Japanese troops had gone to the assistance of the White Russians but, seeing the permanence of the revolution, Britain and America withdrew from the half-hearted intervention. Japan remained in Siberia until 1922 and did not return northern Sakhalin to Russia until 1925. (Russia acquired all of Sakhalin in 1945 as part of the agreement with the allies for her last-minute entry into the war against Japan.)
The interested powers had no intention of giving Japan a free hand in developing her power, and arranged at the Washington Conference in 1921 to impose conditions. Under this treaty the ratio of capital ship tonnages between Britain, the United States and Japan was set at 5:5:3. In 1923 the Anglo-Japanese alliance was abrogated and the London Naval Treaty of 1930 imposed further limitations upon the Imperial Japanese Navy. Anti-British feeling grew in Japan as pro-German sentiments increased. The technical exchange between Britain and Japan had ceased with the abrogation of the alliance. Since there was no prospect of support from the United States, with whom a fatal rivalry was now developing, Japan sought a new partner to supply essential technical expertise.
Britain’s building of the Singapore naval base caused a furore in Japan where it was seen as an Anglo-American provocative measure to attempt to limit Japan’s interests in the Pacific. In 1937, when the Sino-Japanese War began, relationships deteriorated further. Japan took full advantage of her time in China to develop and refine tactics and machinery. While the Stukas were being tested in Spain, a similar experience was being enjoyed by the Zeros in China. After the outbreak of war in Europe in 1939, Japan moved closer to Germany, culminating in September 1940 with the signing of the tripartite pact. Japanese confidence had developed into Japanese over-confidence.
The attack on Pearl Harbor was a repeat performance of the attack on Port Arthur. As if to acknowledge that point, the lead carrier Akagi flew the same battle flag as Admiral Togo had flown on the Mikasa during Japan’s pre-emptive strike on Port Arthur. What was surprising was that on 19 February 1942 a smaller Akagi carrier group would make a similar, successful, surprise attack on the airfield and ships at Darwin in what was to be described in Australia as ‘a day of national shame’.