How to add the Russian version of the site to the index?

Question

Google

Hello! There are 2 versions of the site, Russian and English. I made the English version open for foreigners by default. I look in Google, positions began to fall, I open the site and see that there is only the English version in the index, since Google robots are "foreigners" and they open the Yong version by default. How to make the index contain both Russian and English versions?
I played with the sitemap - www.csgoseller.ru/sitemap.xml, I don't know if I set it up correctly or not. And do you even need to touch it? Who faced, help, please.

Answer 1

1) make sitemaps in both languages
​​2) add to Googlewebmasters as two sites, set landmarks = Ru for Runet, En for everything else