Tired of staring at a Russian flag while your country is being invaded by the Russian army, but still need to type with different keyboards including the Russian character set? Then just copy the .keylayout and .icns file into /Library/Keyboard\ Layouts/ on your Mac! You probably need to reboot and then you may choose the layout under System Preferences->Keyboard->Input Sources.
git clone https://github.com/doterax/Russian-Demilitarized-Mac.git
cd Russian-Demilitarized-Mac/
sudo cp Russian\ \(Demilitarized\).* /Library/Keyboard\ Layouts/
Feel the need to update the layout to your liking by adding in the Ukrainian language characters? Download the keyboard layout tool Ukelele and have at it.