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.