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The claim that Japan and Germany were only ' allies on paper' is not historically correct. The greatest intelligence operation perhaps in history was located in Tokoyo and run by a one Richard Sorge ; excerpt:
Richard Sorge, a Soviet spy, succeeded in infiltrating Japanese society by recruiting Japanese agents for eight years, from 1933 to 1941. Sorge, a German who became a Soviet citizen and worked for the GRU, Russia’s military intelligence arm, maintained the cover story of being a German journalist.
Sorge’s job was to provide intelligence on relations between Japan and Nazi Germany and to assess Japan’s intentions toward the Soviet Union. Moscow feared Japan’s territorial ambitions on her eastern borders.
In October 1941, the Kempei Tai, Japan's military counterintelligence arm, and Tokko, the domestic "thought police," moved on Sorge’s network. Sorge and his chief asset, Ozaki, were arrested, tried, and found guilty. They were executed by hanging on November 7, 1944. Ozaki said before his death, “I sometimes thought secretly that, as a Communist in Japan, it is even something to be proud of that I engaged in such a difficult and disadvantageous work.”