Two years after leaving office, Joe Biden couldn't resist the temptation last year to brag to an audience of foreign policy specialists about the time as vice president that he strong-armed Ukraine into firing its top prosecutor.

In his own words, with video cameras rolling, Biden described how he threatened Ukrainian President Petro Poroshenko in March 2016 that the Obama administration would pull $1 billion in U.S. loan guarantees, sending the former Soviet republic toward insolvency, if it didn't immediately fire Prosecutor General Viktor Shokin.

"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,'" Biden recalled telling Poroshenko.

"Well, son of a bitch, he got fired. And they put in place someone who was solid at the time," Biden told the Council on Foreign Relations event, insisting that President Obama was in on the threat.

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But Ukrainian officials tell me there was one crucial piece of information that Biden must have known but didn't mention to his audience: The prosecutor he got fired was leading a wide-ranging corruption probe into the natural gas firm Burisma Holdings that employed Biden's younger son, Hunter, as a board member.

U.S. banking records show Hunter Biden's American-based firm, Rosemont Seneca Partners LLC, received regular transfers into one of its accounts -- usually more than $166,000 a month -- from Burisma from spring 2014 through fall 2015, during a period when Vice President Biden was the main U.S. official dealing with Ukraine and its tense relations with Russia.