I photographed this lovely folk style book in the Russian booth at the Bologna Book Fair
last April, but didn't feel like posting it because I didn't have any info about it.
Finally, thanks to a cyrillic decoder and Google Translator, the mystery is solved!
Titled White hare, where have you run? (thanks to quete and reset for the correct
translation) and illustrated by Karinna Germanovna Pretro, it's a compilation
of traditional songs, nursery rhymes, riddles, tongue twisters and lullabies.
(Now, if only I could find a bit of information about the illustrator...)
Update: this info is now available in the comments to this post.
Many thanks to Maria, quete and Irina for the data and links!