Well, I do, I understand quite a lot of Russian, though I can't stand watching the Russian networks for long, but it's hard to tell how much of it is BS at times.

It seems that the Russians kind of "borrowed" them, to, you know, keep them safe or something, effectively as prisoners of war or hostages or something and have been putting them through pro-Russian indoctrination of some sort, under the guise of keeping up their education before they send them back. Yes, evil and illegal, but actual state-sanctioned stealing children for adoption would be a whole other level and we have to at least recognise the possibility that "even the Russians" aren't going that far and these children are ostensibly going to be returned, through similar back-channels to those used for PoWs. I'm talking generally here, for sure there's been some shady shit going on with kids since this whole thing began: https://abcnews.go.com/International/ukrainian-families-reunite-children-russia-kidnapped-put-adoption/story?id=93798931. I think we have to realise also that there are multiple different actors and structures in Russia with different agendas, before anyone thinks I am defending Russia in any way, I doubt there is any one single policy, just like they can't even seem to field one single unified army.