can you please give more details about this issue? I believe the reason for the missing support could be because the plugin uses a few methods for escaping certain characters that could cause problems with the HTML and also with the database. Do you use Cyrillic for the rest of your blog? I can try to debug my plugin to see where it fails. Hopefully I will find a solution for it.
I have a blog in Russian langiage. Probably you need to enable “UTF-8” in the plugin.
In addition, the description of the fields in your plugin is correctly in Russian.
Example: Статистика Последние 5 добавленных цитат
I think, u need to do this: copy some russian (or other cyrilics) in you clipboard and past in in your plugin. Then press “Save” button and you can see: ?????????????????????????
Try this words: “Это проверка на русском языке, это кириллица”
If u need more russian symbols, you can use google-translator : http://translate.google.com/#en|ru|
Type some words on english and copy translated in you clipboard. Then test it.
Remember: need a UTF-8 support in your blog. and, may be, your windows/linux/Mac MUST support cyrylic (if you can not see russian symbols right now and here – your OS (windows/linux/mac) do not support cyrylic).
Ok, so I’ve testet this and it works just fine in my test installation. My blog is in UTF-8 and I can see the russian symbols here and in my own blog afer saving the as a quote. Both in the edit screen and by using the widget as a visitor.