What spying, trade negotiations, or other intelligence gathering did the Empire of Japan employ in order to prepare for their push South and December 1941?

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Hi Indy and Team, thank you you for this wonderful dive in to history.

Intelligence gathering is done by all major beligerents to help their decision making. On July 2nd 1941, Japan made the decision to turn to the south. What spying, trade negotiations, or other intelligence gathering did the Empire of Japan employ in order to prepare for their push South and December 1941?

Highest praise for the TimeGhost and the entire team.

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