What I want to know is WHY you are so concerned about who the HELL it was that started that madness??
The only thing that matters is that it was GERMANS that started those murders of the innocents and GERMANS who continued it! Understand?
The Japanese invasion of China precipitated a chain of events that's still going on ~ to wit: North Korea's nuclear warheads and missiles!
It's very important to not limit our considerations to Europe alone ~ in this particular World War Europe was but a mere theatre!