Writing about such a large and diverse entity as the region that was formerly the Russian Empire and trying to include its ethnicities and national movements in their variety is tricky by default. So you know going into such a book will require effort and patience. However, the book reflects the complexity of this era and how many voices were striving to be heard in this reorganization of this enormous territory
Pipes segues into Lenin's usage of the national movements to pursue his own ends after a discussion of various national movements, how Marx and Engels felt the idea of ethnic minorities was a non-issue, and how certain groups were trying to develop an idea of national self-determination to be followed. The models of territorial nationalism vs. extraterritorial nationalism are particularly intriguing, as are the particular and robust stances certain political movements took on the idea of nationalism.