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I think his whole career has been built on his connections, most via his father, to the upper echelons of the US government, but he's not alone in that by any stretch of the imagination, i.e. one of his business partners was John Kerry's stepson. He's a lobbyist, so people pay him for his ability to work those connections.
Did he really make tens of millions of dollars - he served on the board of Burisma Holdings for 5 years, on a retainer of up to $50k a month - so a total of $3 million for the term. That's a lot of money, but it's not tens of millions. Did he have another source of income in Ukraine?
Added: There have been a lot of allegations, predominantly from Trump and his allies, but to my understanding, these are without foundation.
How was a chaotic addict making tens of millions of dollars from Ukraine?