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“[Maksim and Kurmanbek Bakiyev] were up to their elbows in dirty financial transactions connected to the fuel contracts at Manas, and I am sure a lot of that stuff is still going on since he has been ousted,” Mr. Mankoff said. “But I am not sure that exposing it would do credit to the United States any more than it would to any group that happens to be in power in Bishkek.”

The younger Mr. Bakiyev appears to be less popular in Kyrgyzstan than his father and his uncle, who are being tried in absentia for their roles in the deaths of more than 80 Kyrgyz citizens during the 2010 uprising, among other charges. Maksim, who was expected to be his father’s likely successor, was not directly implicated in the 2010 violence.

Kyrgyz prosecutors have said that companies owned by Maksim Bakiyev owe $80 million in unpaid taxes on aviation fuel sold to suppliers of the Manas Transit Center.