cat in locale ru_RU.utf8 or this is the bash issue?

[Peter Volkov Alexandrovich]

Hello.

I've changed my locale to ru_RU.utf8 and now I have some problem is with cat 
utilty. When I do:
$ cat
words in russian<enter>

I should get the same string again. But if I misstyped and then edited my 
words in russian language with backspace then next line differs from the 
previous. So if I type:

абг<backspace>в

the first line will be:

абв

but the second

аб�

As you can see 3-d character changed. It is not `в`.

I have GNU bash, version 3.00.13(1)-release and 5.2.1 version of coreutils.

Thank you for your attention.
-- 

______________________________________

Volkov Peter, <address@hidden>
General Physics Institute,
Russian Academy of Sciences.
______________________________________

Linux 2.6.9-gentoo-r13 i686
Intel(R) Pentium(R) M processor 1700MHz