Directly from ebookwise.com:
Can the eBookwise-1150 display Cyrillic or Asian characters?
No.
The eBookwise-1150 only supports English language, Western European and a selection of Greek and special characters. Documents using Asian, Cyrillic, or fonts for other languages cannot be displayed on the device.
I know the lBook supports Russian, but it's a tad more expensive than the 1150.
http://www.lbook.com.ua/en/F.A.Q.