At the specific request of then-Vice President Joe Biden, the CIA buried an embarrassing intelligence report detailing the poor view the Ukrainian government took of his diplomatic efforts and the business dealings of his own family in that country.Biden had traveled to Kyiv in December 2015, ostensibly to meet with leaders of that fledgling democracy and to deliver a warning against “the cancer of corruption.” And during an address to the Ukrainian parliament, he did condemn the “pervasive poison of cronyism, corruption, and kleptocracy.”But behind the scenes, Ukrainian officials expressed “bewilderment and disappointment” that the vice president had crossed the...