“Ukrainian law enforcement officials believe they have evidence of wrongdoing by American Democrats and their allies in Kiev, ranging from 2016 election interference to obstructing criminal probes. But, they say, they’ve been thwarted in trying to get the Trump Justice Department to act.

Kostiantyn Kulyk, deputy head of the Prosecutor General’s International Legal Cooperation Department, told me he and other senior law enforcement officials tried unsuccessfully since last year to get visas from the U.S. Embassy in Kiev to deliver their evidence to Washington.

“We were supposed to share this information during a working trip to the United States,” Kulyk told me in a wide-ranging interview. “However, the [U.S.] ambassador blocked us from obtaining a visa. She didn’t explicitly deny our visa, but also didn’t give it to us.”

One focus of Ukrainian investigators, Kulyk said, has been money spirited unlawfully out of Ukraine and moved to the United States by businessmen friendly to the prior, pro-Russia regime of Viktor Yanukovych.

Ukrainian businessmen “authorized payments for lobbying efforts directed at the U.S. government,” he told me. “In addition, these payments were made from funds that were acquired during the money-laundering operation. We have information that a U.S. company was involved in these payments.” That company is tied to one or more prominent Democrats, Ukrainian officials insist.

In another instance, he said, Ukrainian authorities gathered evidence that money paid to an American Democrat allegedly was hidden by Ukraine’s National Anti-Corruption Bureau (NABU) during the 2016 election under pressure from U.S. officials. “In the course of this investigation, we found that there was a situation during which influence was exerted on the NABU, so that the name of [the American] would not be mentioned,” he said.

Ukraine is infamous for corruption and disinformation operations; its police agencies fight over what is considered evidence of wrongdoing. Kulyk and his bosses even have political fights over who should and shouldn’t be prosecuted. Consequently, allegations emanating from Kiev usually are taken with a grain a salt.

But many of the allegations shared with me by more than a half-dozen senior Ukrainian officials are supported by evidence that emerged in recent U.S. court filings and intelligence reports. The Ukrainians told me their evidence includes:

Sworn statements from two Ukrainian officials admitting that their agency tried to influence the 2016 U.S. presidential election in favor of Hillary Clinton . The effort included leaking an alleged ledger showing payments to then-Trump campaign chairman Paul Manafort ;

. The effort included leaking an alleged ledger showing payments to then-Trump campaign chairman ; Contacts between Democratic figures in Washington and Ukrainian officials that involved passing along dirt on Donald Trump;

Financial records showing a Ukrainian natural gas company routed more than $3 million to American accounts tied to Hunter Biden, younger son of then-Vice President Joe Biden , who managed U.S.-Ukraine relations for the Obama administration. Biden’s son served on the board of a Ukrainian natural gas company, Burisma Holdings;

, who managed U.S.-Ukraine relations for the Obama administration. Biden’s son served on the board of a Ukrainian natural gas company, Burisma Holdings; Records that Vice President Biden pressured Ukrainian officials in March 2016 to fire the prosecutor who oversaw an investigation of Burisma Holdings and who planned to interview Hunter Biden about the financial transfers;

to fire the prosecutor who oversaw an investigation of Burisma Holdings and who planned to interview Hunter Biden about the financial transfers; Correspondence showing members of the State Department and U.S. Embassy in Kiev interfered or applied pressure in criminal cases on Ukrainian soil;

Disbursements of as much as $7 billion in Ukrainian funds that prosecutors believe may have been misappropriated or taken out of the country, including to the United States.

Ukrainian officials say they don’t want to hand the evidence to FBI agents working in Ukraine because they believe the bureau has a close relationship with the NABU and the U.S. Embassy. “It is no secret in Ukrainian political circles that the NABU was created with American help and tried to exert influence during the U.S. presidential election,” Kulyk told me.

Kulyk’s boss, Prosecutor General Yuriy Lutsenko, told me he has enough evidence — particularly involving Biden, his family and money spirited out of Ukraine — to warrant a meeting with U.S. Attorney General William Barr. “I’m looking forward to meeting with the attorney general of the United States in order to start and facilitate our joint investigation regarding the appropriation of another $7 billion in U.S. dollars with Ukrainian legal origin,” Lutsenko said.” (Read more: The Hill, 4/07/2019)