Lucene has quite poor support for Russian language.
RussianAnalyzer (part of lucene-contrib) is of very low quality.
RussianStemmer module for Snowball is ev
I used http://code.google.com/p/russianmorphology/
My answer is probably too late, but for the record, I've found analyzers from AOT project much better then those shipped with Lucene.
That's the beauty of open source. You have the source code, so if the current implementations don't work for you, you can always create your own or even better, extend the existing ones. A good start would be the "Lucene in Action" book.
If all else fails, use Sphinx
Project http://code.google.com/p/russianmorphology/ moved to https://github.com/AKuznetsov/russianmorphology. Please take into account the new hosting of this project.