Since the Russian-language forum is dead, I will address it here:
How can players from Russia buy content in TESO if buying in third-party stores is prohibited, and buying in the game store and on the website is not allowed?
I suggest that developers talk about this topic with the Xsolla payment system, which already cooperates with the Epic Games Store and many other online games. It will allow players from Russia to buy in your store officially, and not violate the rules through third-party stores.