I'm very doubtful about you being proven right here, since both Russia and Ukraine claim it's happening. It's published Russian policy. It's unlikely Russia's propaganda number is true (hopefully at least), but imo it's undisputed that it is in fact happening. UN investigators also have stated that this is going on.
Like, this isn't just accusations, Russia confesses to doing this.
Do note that some of these children have been returned, apparently up to 2100 from what I could find.
A constitutional republic is a form of representative democracy.