PC:Japan doesn't annex Korea

Could Japan decide not to annex Korea and leave it as a Japanese protectorate

How would this impact Japanese militarism and expansion

How would Korea look like as a continued Japanese puppet state as opposed to being part of Japan
 
Wasn't Manchuria technically in personal union with China under the Qing? Though I'm not sure that they would see things that way, granted.

How so, I wonder. Maybe the fact that Shenyang held an official status as the secondary capital of the Qing Empire is causing confusions here but it was never a state nor entity separated from the 'main' Empire.
 
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