update
Ukrainian news report October 10, 2019
“the United States arrested two businessmen who helped Rudi Giuliani to lobby the investigation into Joe Biden”
source in ukrainian https://www.pravda.com.ua/rus/articles/2019/10/10/7228742/
The two detained men are Lev Parnas and Igor Fruman, they are accused of violating campaign finance rules (Donald Trump’s election campain).
Ex-USSR; lived in Odessa, Ukraine; both are US citizens.
Igor Kolomoisky claimed that they also came to Israel and asked him to help to meet new Ukrainian president Zelensky.
Lev Parnas and Igor Fruman also lobbied for the dismissal of the US ambassador to Ukraine, Marie Jovanovic.
Ukrainian Prosecutor General Yuriy Lutsenko says that Marie Yovanovic gave him a do not prosecute list during their first meeting.
source in english, The Hill https://thehill.com/hilltv/rising/434875-top-ukrainian-justice-official-says-us-ambassador-gave-him-a-do-not-prosecute
“…Yuriy Lutsenko said he wanted to open an investigation into the likely Ukrainian interference in the 2016 elections. But he would have to “work out” the director of NABU Artyom Sytnik. He, on suspicion of Lutsenko, published information about secret money transfers of former Ukrainian leader Viktor Yanukovych to Paul Manafort to harm Trump. That is, he acted in the interests of Hillary Clinton.”
But Sytnik was in the “do not prosecute list” handed to the ukraininan prosecutor by the US ambassador.
source in russian https://ria.ru/20191012/1559691232.html