USAToday article from Oct 3, 2019/updated Nov 15 detailing the Shokin's removal [article is biased in favor of Biden but provides many event details]
"Explainer: Biden, allies pushed out Ukrainian prosecutor because he didn't pursue corruption cases"
https://www.usatoday.com/story/news/politics/2019/10/03/what-really-happened-when-biden-forced-out-ukraines-top-prosecutor/3785620002/