The Kindle edition is not easy to read because many of the Cyrillic characters are represented by graphics. There is no need for this to be so, because is it perfectly possible to have an optical character recognition program identify text both in English and in Russian.
Amazon really needs to do better when converting mixed language texts to digital format. Some Russian language textbooks have been converted properly and are usable. However, for this book the Kindle edition is best avoided; buy hard copy instead.
(Reviewed using Kindle for PC)