It shows up in the keyboard list in
region & language -> russian -> options:
but not in system tray keyboard layout selection list:
If the words I'm using are not accurate, it's because I can't change my UI language to English right away.
In the language settings, where you got when you clicked on "Russian", you should actually have three options on each language: "As Default", "Options", "Remove/Delete".
If you set Russian as default language, it will appear in the task bar as selectable language. It will stay there, even if you change back to English.
You may have to do this upon every system startup though, because this may be caused by some software installed on your PC. (At least, for me a specific software is the reason for this issue.)