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The good news is that for words that do not have an equivalent you will find that it can provide matched results, e.g.
КОНВЕНЦИЯ >> [google.ru...]
I suppose it comes down to how people will search for your information, will they search in english even though it's not their first language?
You should try and search for a phonetic translation of Russian letters into Latin chars. I know it exists for other Slavic languages that are written in Latin characters.
An example is the Serbo-Croatian language:
for example if I want to optimize for
is there going to help if I name the file:
Am I going to have more problems if I name it:
(the host may make problems. for example may don't have cyrillic or something)
Thanks for the posts you guys,
Your question might be answered looking at this link:
As you can see, the search query "istoria" (history) is highlighted in the URI. This means you can also optimize for Russian chars in URI's.
You might want to use small chars though. It seems like capital letters are not highlighted.
I have made an example using "stranam" (state) as example for small chars:
On another note though. If I were you, I would optimize my website for folder URI's only and hide the file extensions - like you see in the above example.
If you consistently use for example: www.domain.ext/folder/folder/ , it would become a lot easier to change the underlying technology without Google and other SE having to re-index all of your changed URI's.