"But the international community came to view Shokin as too weak on corruption, despite his promises to investigate wrongdoing. The United States, the International Monetary Fund, and others pressured Ukraine to investigate corruption more thoroughly, but Shokin took no serious action. In December 2015, Biden was in Kyiv, where he was scheduled to announce a $1 billion American loan to the Ukrainian government.* Biden told a version of the story himself, in which he condensed the actual sequence of events, at a Council on Foreign Relations event in 2018:"
said, nah, I’m not going to—or, we’re not going to give you the billion dollars. They said, you have no authority. You’re not the president. The president said—I said, call him. I said, I’m telling you, you’re not getting the billion dollars. I said, you’re not getting the billion. I’m going to be leaving here in, I think it was about six hours. I looked at them and said: I’m leaving in six hours. If the prosecutor is not fired, you’re not getting the money. Well, son of a *****. He got fired. And they put in place someone who was solid at the time."
https://www.theatlantic.com/ideas/archive/2019/09/biden-trump-corruption/598705/