A book with some interesting insights into Japanese army thinking prior to WWII is this book from the Naval Institute Press:
Nomonhan, 1939: The Red Army's Victory That Shaped World War II by Stuart Godlman
This is about a series of border clashes along the Manchurian Boarder and Outer Mongolia and other boarder areas between Russia and Japanese held Asia.
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Stuart Goldman convincingly argues that a little-known, but intense Soviet-Japanese conflict along the Manchurian-Mongolian frontier at Nomonhan influenced the outbreak of World War II and shaped the course of the war. The author draws on Japanese, Soviet, and western sources to put the seemingly obscure conflict—actually a small undeclared war—into its proper global geo-strategic perspective.
Nomonhan, 1939 describes how the Soviets, in response to a border conflict provoked by Japan, launched an offensive in August 1939 that wiped out the Japanese forces at Nomonhan. At the same time, Stalin signed the German-Soviet Nonaggression Pact, allowing Hitler to invade Poland. The timing of these military and diplomatic strikes was not coincidental, according to the author. In forming an alliance with Hitler that left Tokyo diplomatically isolated, Stalin succeeded in avoiding a two-front war. He saw the pact with the Nazis as a way to pit Germany against Britain and France, leaving the Soviet Union on the sidelines to eventually pick up the spoils from the European conflict, while at the same time giving him a free hand to smash the Japanese at Nomonhan.
Brian Norden