I'd be hard pressed to come up with a dumber example as justification to put "severe restrictions" on books. Just because you found a book you disagree with? I'm sure there are no books in other languages that contain controversial topics? With such high standards for books, surely "mein kampf" would be "restricted" too right? huh, of course not, doesn't even need an exception 
whataboutwhataboutwhataboutwhataboutwhataboutwhataboutwhataboutwhataboutwhatabo ut fucking hell do they not teach you anything else in the Kremlin troll academy LOL
But yeah, if Mein Kampf was being used by Russians to brainwash children in occupied territories, the import restrictions would likely apply to it as well.