Tip: shortcuts to change between Russian and English keyboard quickly
If you're using Windows 10 (not sure about other versions), Windows button + space changes between languages, and Windows button + ctrl + space changes between the previously used languages. This is especially useful when I'm doing a timed practice, where I have no time to move my mouse to change the language!
This is useful particularly for people who have many keyboards on the desktop, where takes time to go through all the languages with Shift + Alt
You can also set a specific key code for each language (useful if you have many). Back when I didn't use a mac, I always set mine to ctrl + shift + 1, ctrl + shift + 2, etc. That way I didn't have to go through each language to get to the one I wanted. Go into Regional and Language settings-->Keyboard to add your languages and set their shortcuts.