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.