There’s nothing to be puzzled about. Trump’s whole original business was doing real estate and other money laundering activities (e.g. casinos) for the New York Russian Mafia.

Later, the Trump family was bailed out of their financial situation with Russian money. [1]

The only thing to be puzzled about is how a convicted felon mediocre mafia landlord who sold steaks on TV got elected.

[1] https://thehill.com/homenews/news/332270-eric-trump-in-2014-...