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.
And how about south (Krasnodar and may be most part of Black Sea coast)? They really use another words than for example in Siberia. And they accent it's more look like the Ukrainian than the Russian.
And the Ukrainian it's not the Russian or some dialect of it. It's another language! Some russians (included me)may be can understand what say at East of Ukrain, but not at West. Because it's really different languages, I know what I say because I tried to study it.

And about Japannies))) They so funny! They make as mistakes as make I. And in real we talking about something with less problems than with my american friend. mmm But I think good language it's better than comfort dialogue.
In Japan, for example, most people have studied English in school, but there is a lot of native language interference in pronunciation, so it can be very difficult for native English speakers to understand Japanese English speakers.
I think they have such pronunciation becase many english words they use in daily life. And ofcouse they pronunce it like Japannies not English. It's seem like hmmm for example "monitoring", when we use it in Russian it's sound like "мониторинг".

I know that text have more than one mistake. Каюсь, грешен!