DBWI AHC make the Nazi War longer and bloodier

I was thinking of doing a dystopian timeline where the Nazi War winds up lasting longer and taking more lives than the Great War. Any ideas? Is there any way to link it up with the Sino-Japanese War?
 
OTL, Hitler rebuffed the Japanese when they tried to stop the flow of supplies into China via French Indochina, which led to them putting further expansion South on hold and using the Siamese to try and disrupt the supplies. If you want to link up the Nazi war and Sino-Japanese war, this is your best bet for a POD.
 
"Hitler rebuffed the Japanese when they tried to stop the flow of supplies into China via French Indochina"

I didn't know this, but I'm confused how Hitler got any say in what was going on in French Indochina.
 
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