Valve has forbidden to freely change the region of the account on Steam.
Now, to change the country, you have to buy the game in the store.

If you have moved to another country or have been living abroad for a long time, you can change your country in the Steam settings during your first purchase using the payment method valid for that region. If your location is different from the current account settings for the Steam store, you can change the region when viewing your cart or completing a purchase ” - says the new rules.

Earlier in the store from Valve added the ability to participate in the beta test of games.