Even if US legalizes it (it has not made it illegal either), India would be the last country to legalize such a thing, unless it realizes the huge potential to attract trade and investments via ICO route or getting global startups scene to invest into India. In my opinion, India looks at other countries as guinea pigs, where policies are put to test, and observes the flaws and them improvises upon them before introducing it to its own structure.

China has an entirely different agenda and 'why' (of world domination) and would repel bitcoins till it aligns with its own agendas.

None of these countries follow US or any other countries for monetary policies blindly, but definitely are influenced to some extend.