Quote Originally Posted by kottoo
It's impossible in Russia, definitely. So maybe Russia is a sort of phenomenon from this point of view, but it is as it is - modern Russian is quite a uniform language.
But many people use this morden Russian day by day. It's not so simply to force someone "speak Russian", when you can't understand, what he try to explain you.
I'm afraid I do not quite understand your point, and especially your "but".

And how about south (Krasnodar and may be most part of Black Sea coast)? They really use another words than for example in Siberia.
Could you provide some examples please? I've been to the Black Sea coast, and I never had any problems with understanding people there.

And they accent it's more look like the Ukrainian than the Russian.
The only "Ukrainian" thing in their speech is the "г" and the "-ов" at the end of words, i.e. pronunciation. But not everyone in the south speaks like that.