The 12,000-page record says he complained in July 1939 to Army Minister Seishiro Itagaki about the military's "predisposition" as it strengthened its relationship with Germany, Kyodo reported. He also warned against the navy's call for war with the United States, predicting in July 1941 that it would be "nothing less than a self-destructive war."
The record also cites U.S. Gen. Douglas MacArthur, who led America's postwar occupation of Japan, as saying Hirohito had said he accepted full responsibility for the war.
An advance copy of the report was made available to some Japanese media, but the Imperial Household Agency turned down requests from The Associated Press for a copy. It is to be published in stages over five years beginning next March.
The project began in 1990 and cost 200 million yen (USD 1.9 million). Kyodo said it provides little new material and is unlikely to change current thinking about Hirohito. It does make public some letters and essays he wrote as a child.