The Russian league certainly isn't a top league and I'm not sure how anyone can seriously argue with a straight face that it is.
As for Portugal, It's not a one team league, but to be fair Porto are the biggest club with the most resources.
Name a top manager that is managing in the Russian league at the moment? Of the top 10 managers in world football, how many would you say are managing in that league? Besides AVB of course who is clearly in the top 5
I'll be impressed if you can name one manager in total besides AVB.
If he proves himself in any of the top 4 leagues then I will change my opinion of him, but as I said before, I can't see any top club in any of the top leagues going for him.