This book delivers exactly what it says on the tin. There's a detailed description of the Lunar exploration carried out by the USSR - and the very early stories are particularly well done. The 'Russian' section is sketchy, mostly due to Russian Moon plans being, well, sketchy.
The only minor drawback with the book has to be the pictures, which are rather muddy. Few good (in modern terms) Soviet spaceflight pictures exist, so it's not surprising. So, don't expect a picture book - this is a story, not an art exhibit.