How does Sikkim not die?

Maybe Sikkim could ally with Nepal and Bhutan to form a sort of alliance focused on Himalayan kingdoms and countries.

Bhutan was basically vassal of India and not sure if Nepal feels any reason to ally with Sikkim. And taking how shitty Bhutan has threatened its own Nepalese minority Nepal hardly is willinful ally with Bhutan unless Bhutan change its politics.
 
Bhutan was basically vassal of India and not sure if Nepal feels any reason to ally with Sikkim. And taking how shitty Bhutan has threatened its own Nepalese minority Nepal hardly is willinful ally with Bhutan unless Bhutan change its politics.
Then what about just Nepal and Sikkim, say that Nepal has a reason to ally Sikkim. (whatever that reason may be)
 
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