How Do Authoritarian Regimes Collapse?

Russia has a long history of causing other nations to retool their domestic liquor production towards making bombs. They have had this really interesting role in arming non state actors, or liberation movement through our history. And one really interesting thing i read about them was by this academic who really like his work. Et's called ali cadiva, and he's a rain and he's looked like democratization movements all over the world. So how do authoritarian regimes collapse?