Have China as weak as possible

It can be multiple Chinas. As long as the land areas we call today as 'China' is economically, militarily, and influentially weak as much as possible, this satisfies the main requirement

Possible scenarios:
Chinese balkanization after the fall of the Qing Dyansty
The RoC manages to split China evenly during the Civil War
Deng Xiaoping, or other liberal PRC leaders never come into power

Requirements:
At least one foreign country should have territory in China. Russia seems as the most possible one
The Chinese economy/economies can not be in the top 10. Although if China balkanizes, the combined economies may be included there.
 
Just continue to divide China along the lines it was divided circa 1940: a few communists, a token central government, a half-dozen foreign nations meddling and dozens of local warlords.
 
Simple, the Beyang government "unifies" china. They were so corrupt and weak that problably china would be more like a federation of warlords than a really united states, i doubt that the Beyangs would be able to annex Tibet like the PRC did
 
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