I've mentioned them frequently - in the contexts of the heavily investigated crimes they committed and the curiously uninvestigated crimes that were committed against them.Of course you haven't mentioned the insurgents as they're rather inconvently quite violent only rose up when Russia took Crimea
Did the Ukrainian government pinky promise not to do that it again and to bring the perpetrators to justice just the very moment it was convenient? Is that why they and only they are getting.the free pass?
If you'd suggested even in 2020 letting the Bosnian Serbs investigate their own war criminals, you'd have been laughed at. Suggesting it while the war was still going on would have got you sectioned under the Mental Health Act.