Leaked phone calls between Biden and Ukrainian President Petro Poroshenko explicitly detail the quid-pro-quo arrangement to fire former Ukrainian Prosecutor General Victor Shokin - in exchange for $1 billion which Biden openly bragged about in Jan, 2018. https://www.zerohedge.com/geopolitical/phone-calls-between-quid-pro-joe-biden-and-ukraines-poroshenko-leak-explicitly-details

This alleged (and not yet independently verified) recording purports to show a much deeper and more explicit quid pro quo than previously thought.

The leaked calls begin on December 3, 2015, when former Secretary of State John Kerry starts laying out the case to fire Shokin – who he says “blocked the cleanup of the Prosecutor Generals’ Office,” and sated that Biden “is very concerned about it,”

Poroshenko replies that the newly reorganized prosecutor general’s office (NABU) won’t be able to pursue corruption charges, and that it may be difficult to fire Shokin without cause.

On February 18, 2016 – less than three months after the Kerry conversation – Poroshenko delivers some “positive news.”
"Yesterday I met with General Prosecutor Shokin.  And despite of the fact that we didn’t have any corruption charges – I specially asked him to resign"

On March 22, 2016, Biden says “Tell me that there is a new government and a new Prosecutor General. I am prepared to do a public signing of the commitment for the billion dollars.“

On May 13, 2016, Biden congratulates Poroshenko on “getting the new Prosecutor General”
“And I’m a man of my word,” Biden adds. “And now that the new Prosecutor General is in place, we’re ready to move forward to signing that one billion dollar loan guarantee.”

For reference, here's Biden bragging:
“I looked at them and said, ‘If the prosecutor is not fired, you’re not getting the money"

Here's the audio.
Sure sounds exactly like Joe Biden and John Kerry.