Much of what you post is true and some of it is supposition.
But all of it falls under the umbrella of politics as usual.
But this,
has been explained many times. Biden was the point man for a unified group of nations who were adamant that Shokin be fired. The current occupants campaign simply parsed and omitted words to make it appear that something happened that never happened.
From Politifact…
“Joe Biden pressured Ukraine to fire its prosecutor.”
Biden did call for Ukraine to fire Shokin, but the ad fails to note that there were widespread calls for his ouster.
Biden assumed a lead role in U.S. diplomacy toward Ukraine after a popular revolution in early 2014 that led to pro-Russia President Viktor Yanukovych fleeing the country. Shokin became top prosecutor in 2015, after Yanukovych went into exile. A frustrated Biden in Dec. 2015 threatened to withhold $1 billion unless Shokin was fired, in hopes that a new prosecutor would do more to enforce the law. According to Biden, it worked.
The Trump campaign ad includes a clip of Biden’s partial reports at a Jan. 23, 2018, event sponsored by the Council on Foreign Relations. Biden spoke about getting a commitment from then-Ukrainian President Petro Poroshenko and from then-Prime Minister Arseniy Yatsenyuk.
“I looked at them and said, ‘I’m leaving in six hours,” Biden recounted. “If the prosecutor is not fired, you’re not getting the money.’ Well, son of a b----. He got fired. And they put in place someone who was solid at the time.”
"Fact: the prosecutor said he was forced out for leading a corruption probe into Hunter Biden’s company."
There is evidence that many Western leaders and institutions, as well as Ukrainian anti-corruption activists, viewed Shokin as corrupt and ineffective for failing to prosecute anybody of significance, and for protecting members of Yanukovych’s and Poroshenko’s circles.
When Shokin was fired in the spring of 2016, press reports explicitly linked his ouster to corruption.
Steven Pifer, a career foreign service officer who held positions in the Clinton and George W. Bush administrations, previously told PolitiFact that “virtually everyone” he knew in the U.S. government and virtually all non-governmental experts on Ukraine “felt that Shokin was not doing his job and should be fired.”
“All decent people were in favor of Shokin’s sacking,” Anders Åslund, a resident fellow at the Atlantic Council told PolitiFact. “Biden led a Western/anticorruption consensus.”