What are you talking about? I said that these countries are NOT third world and I have certainly never thought that they were and nobody in Sweden or anywhere else thinks that. Read what I wrote again. And read Nulle's comment before mine - he seems to be saying that the USSR became 3rd world. I don't agree with that.
It used to be "2nd world", but that expression was never actually used, although the idea was that the European socialist economies were "2nd world". Pretty much everything else in Africa and most of Asia was considered developing countries and/or third world. Perhaps these terms are getting outdated now.
How to categorise the ex - socialist countries in the 1990s and now (1st, 2nd, 3rd) I really don't know - you are probably better placed to say how you would categorise it.