Do you know how tu buy in another uplay stores?

Depends, where are you located? If you aren't in India, then obviously you can't buy from the Indian store with Indian pricing.

Obviously I'm not in the country where I want to buy the game. I'm in Spain but that's why I use proxy. It works in a lot of stores but they seems to detect my country as Ireland instead of India, Russia or Indonesia.

It is tied to the address on your payment method, so unless you subscribe to an online credit card service (which comes with a relatively large percentage cost), you are locked to your local store.

India uses the EU store I think 🤷

You can't do this. Ubi.Shop remember your country in account. And you can change country ONLY via Ubisoft support with proof documents.
In addition, you can not activate a Uplay-key from another region. For example, you can not activate in India awfully expensive Uplay-key from the UK.

Create new account while your VPN is ON

As I said before I didn't logged into my account. I only open the web trought VPN/proxy and then I see the price in €uros. Always in a clean browser with no cookies. Try by yourself. I only want to know if this is normal (they only can pay in €) or I'm doing something bad.

BTW thanks!