The copyright to GK's memoirs is very definitely still in existence and in the ownership of his survivors. I asked them about a year ago.
So let me ask this: If this book is considered in the public domain in Russia, but is still in copyright in the US, then can a book legally published in Russia be sold in the US without royalty payments being made to the copyright holders?
If it can be, then this is a shady practice, and I would think that no reputable publisher would take advantage of such a "loophole."