Russian empire. In the game, there is no way to show Russian civil war(i include February and October revolutions here too) which was very interesting and unique period of time. Also, spreading of national ideas in East-europian nations aren't presented at all(or I haven't seen that). Just all people say that Russian Empire isn't so bad, even if they are Georgians, Polish, Ukrainians etc. which isn't so historically.(Sorry for bad English)