Well the difference between Putin and Trump is that Putin has way bigger fish to fry than money laundering. He may be a kleptocrat first and foremost, but he's also a KGB alumnus who cares deeply about statecraft. Having Trump in his pocket does way more for him than give him unrestricted access to his billions. It gives him a backstop for when he does shit like the recent chemical weapons attack in UK. Trump is so shallow that the money is all there is. For Putin, the money is just a means to an end. If he loses access to some overseas cash, he has a lot more elsewhere. Big deal.