There is a new novel that has just been published that examines the possibilities of a Russia in which the Revolution of 1917 had not happened, and Alexei (Tsar Nicholas' hemophiliac son), had become tsar:
https://www.amazon.com/Triumph-Tsar...swatch_0?_encoding=UTF8&qid=1516564948&sr=1-1
https://www.amazon.com/Triumph-Tsar...swatch_0?_encoding=UTF8&qid=1516564948&sr=1-1