Hi paulaE
I am Dave, I will help you with this.
I need a bit more information on your requirements.
You have a physical English language keyboard and you do not want to use a Russian keyboard, is that correct?
If you want to type Cyrillic characters on an English keyboard, you just need to use a Cyrillic font to produce Cyrillic characters.
You can also add the Russian keyboard language in Settings - Time and Language - Language
You can then swap to the Russian Keyboard Language at the bottom right of your screen.
Another option may be then to use the on-screen keyboard
However, none of the above will allow you to see those characters on your keyboard