Some Shokin revelations

Prosecutors in Ukraine have been infamous for using the state’s power to investigate crimes, then demanding a payoff from the target, and closing the case.

Viktor Shokin was the Prosecutor General of Ukraine under president Poroshenko.

In March 2016 Shokin's office carried out a raid against one of Ukraine's leading anti-corruption groups, the Anti-Corruption Action Center (AntAC), a critic of Shokin, claiming that it had misappropriated aid money. In another notorious case, two of Shokin's prosecutors were caught with stashes of diamonds, as bribery. When other prosecutors from another department of Shokin's office attempted to bring a prosecution against the so-called "diamond prosecutors", they were fired or reassigned.
https://www.bloomberg.com/news/articles/2019-05-07/timeline-in-ukraine-probe-casts-doubt-on-giuliani-s-biden-claim

Trump endorses Ukraine's swamp monster, prosecutor Viktor Shokin

In 2016, Shokin's immediate deputy, Vitaly Kasko resigned from his post, describing his boss' "hotbed of corruption."

Trump called this ex-Ukrainian prosecutor ‘very good.’ But he resigned in disgrace.

“I heard you had a prosecutor who was very good and he was shut down and that’s really unfair.  A lot of people are talking about that, the way they shut your very good prosecutor down and you had some very bad people involved.”