Apple has standard layouts depending on country or region. If you BTO from the online store. You can choose the keyboard used.
Except for Japanese. Apple uses the ANSI or ISO layout. Depending on the keyboard standard to your country or keyboard you select.
I suppose Russian would be the most standard Cyrillic layout. It's what Apple ships to multiple countries which use Cyrillic. Uses the ISO layout. Then you can choose variations in the OS for your specific country. Although the visual layout will be Russian.
Here's a list of the layouts. Pay attention when you find your country if it is a visual and physical layout you can buy or just a localized functional layout in the OS.
Identify & change your Mac keyboard layout using this complete guide with 80 keyboard layout images. Learn how to match the input source to the physical keys on your MacBook or Apple keyboard. No matter if you need QWERTY, AZERTY, Dvorak, or other - we'll guide you here.
keyshorts.com
If you open and zoom in on the infographic. It's easier to see what Apple sells. The left column is what can be bought and the right column is what is available in the OS.