Am not sure whether Putin is the richest person in Russia. Who would know?
I'd ask Wilbur Ross, the Trump US Secretary of Commerce. He was the VP of the Bank of Cyprus when Putin started banking billions there, and money laundering accusations at the bank were around. Ross was the guy who helped Trump out when he was a washed up bankrupt loser in 1993. Of course Dmitri Ryboloylev was in Bank of Cyprus too. Bought that house in Florida from Trump. Trump and his best bud Epstein fell out about that.
All of this has been confirmed and is in the public domain in court documents and hundreds of articles. But when it comes to Putin's money, the Bank of Cyprus and the current US administration, I think it's PC to look the other way and pretend nothing is happening.