I have been fascinated by Russian (and other Eastern European) illustration for awhile. I'm not knowledgeable about it. I just like it, especially the somewhat primitive, folk-art style of pieces like those I share below.
The first three are by Igor Galanin.
The next is by Nikolay Kochergin.
I don't know who did the next one, but I love how the bright, cozy, domesticity contrasts with the dark, frosty outdoors. I also love the layer of autumn leaves under the snow.
These can all be found on Library Things, a blog showcasing Russian children's books. The blogger sells Russian children's books on Etsy at HannaRivka.