I was raised on these Soviet books in India and remember feeling sad and angry when Soviet Union broke up because all these amazing magazines (Misha anyone ?) stopped coming from Russia all of a sudden.
PS: I uploaded about 50 of these books (in Telugu language) at http://linkdot.link/sooviytt-prcurnnlu-childrens-books.html Would be a great resource for anyone trying to teach Telugu to their kids
Edit: Added a line