Re: the Burisma investigation: "But after Ukrainian prosecutors refused to provide documents needed"
Britains Serious Fraud Office, an independent government agency, specifically forbade Mr. Zlochevksy, as well as Burisma Holdings, the companys chief legal officer and another company owned by Mr. Zlochevsky, to have any access to the accounts.
But after Ukrainian prosecutors refused to provide documents needed in the investigation, a British court in January ordered the Serious Fraud Office to unfreeze the assets. The refusal by the Ukrainian prosecutor generals office to cooperate was the target of a stinging attack by the American ambassador to Ukraine, Geoffrey R. Pyatt, who called out Burismas owner by name in a speech in September.
In the case of former Ecology Minister Mykola Zlochevsky, the U.K. authorities had seized $23 million in illicit assets that belonged to the Ukrainian people, Mr. Pyatt said. Officials at the prosecutor generals office, he added, were asked by the United Kingdom to send documents supporting the seizure. Instead they sent letters to Zlochevskys attorneys attesting that there was no case against him. As a result, the money was freed by the U.K. court, and shortly thereafter the money was moved to Cyprus.
https://www.nytimes.com/2015/12/09/world/europe/corruption-ukraine-joe-biden-son-hunter-biden-ties.html