Please don't assign issue to people without them telling you to do so.

Also, please state what you exactly you mean with "don't works".
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Acronyms only work with one capital letter followed by some capital letters or numbers. By letter, we mean A to Z... So @Blah(de fi ni tion)@ will produce Blah(de fi ni tion).

In your example, are "Россия" all capital letters in russian alphabet ?
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Yes, for example:

en: RUSSIA(Country)
ru: РОССИЯ(Страна)
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OK. It won't be easy to implement until we fully support Ruby 1.9, which comes with the right libraries to handle non-ASCII characters.

For the record, everything happens line 459 of @lib/redcloth3.rb@ (maybe we'll be on RedCloth4 when we support Ruby 1.9...). Regex with Unicode selectors like @"РОССИЯ".match(/^\p{Lu}+$/)@ should work on Ruby 1.9+ (PCRE lib is too old on Ruby 1.8.x)
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Hello. This is my version of solving problem.

1. Add trigger to wiki_pages table:
<pre>
-- Trigger: alex_wiki_pages_tolower on wiki_pages

-- DROP TRIGGER alex_wiki_pages_tolower ON wiki_pages;

CREATE TRIGGER alex_wiki_pages_tolower
AFTER INSERT OR UPDATE
ON wiki_pages
FOR EACH ROW
EXECUTE PROCEDURE alex_wiki_pages_tolower();
</pre>

2.add trigger function to redmine postgresql database:

<pre>
-- Function: alex_wiki_pages_tolower()

-- DROP FUNCTION alex_wiki_pages_tolower();

CREATE OR REPLACE FUNCTION alex_wiki_pages_tolower()
RETURNS trigger AS
$BODY$
BEGIN
NEW.title=lower(NEW.title);
return NEW;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;
ALTER FUNCTION alex_wiki_pages_tolower() OWNER TO postgres;

</pre>

So new pages will created in small leters, even if you taped in capital letters.
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Not resolved in Redmine 2.6.10.stable
Will it be resolved in nowadays versions?

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duplicates,Closed,9665,Wiki format: acronyms in Cyrillic do not work, see example
duplicates,Closed,14765,Acronyms do not work for Russian
blocks,Closed,4050,Ruby 1.9 support