Not in my experience. From what I've seen(as a slav) nobody considers slavs as being on the same level as white people. Maybe slightly above ethnics but that's it.
I've read good arguments against them being white. They certainly have a more Asian and collective culture. Some of them even have a yellowish tint.
I've read that even in Germany, German men a prefer fat german woman to a thin Slavic (Polish, Russian) woman because it is shameful to be associated with them.