After reading this, I've changed my mind about Trump and Putin. I don't know if it's 100% accurate or not but it certainly does explain quite a bit.
A Theory of Trump Kompromat
Why the President is so nice to Putin, even when Putin might not want him to be.
https://www.newyorker.com/news-desk/swamp-chronicles/a-theory-of-trump-kompromat
There is no need to assume that Trump was a formal agent of Russian intelligence to make sense of Trump’s solicitousness toward Putin. Keith Darden, an international-relations professor at American University, has studied the Russian use of kompromat—compromising material—and told me that he thinks it is likely that the President believes the Russians have something on him.
...
Ledeneva argued that wealth and power are distributed through networks of political figures and businesspeople who follow unspoken rules, in an informal hierarchy that she calls the sistema, or system in English. Sistema has a few clear rules—do not defy Putin being the most obvious one—and a toolkit for controlling potentially errant members. It is primarily a system of ambiguity.
...
The scenario that, to my mind, makes the most sense of the given facts and requires the fewest fantastical leaps is that, a decade or so ago, Trump, naïve, covetous, and struggling for cash, may have laundered money for a business partner from the former Soviet Union or engaged in some other financial crime.
...
Trump and many of his defenders have declared his businesses, including those in the former Soviet Union, to be off-limits to the Mueller investigation.
A Theory of Trump Kompromat
Why the President is so nice to Putin, even when Putin might not want him to be.
https://www.newyorker.com/news-desk/swamp-chronicles/a-theory-of-trump-kompromat
There is no need to assume that Trump was a formal agent of Russian intelligence to make sense of Trump’s solicitousness toward Putin. Keith Darden, an international-relations professor at American University, has studied the Russian use of kompromat—compromising material—and told me that he thinks it is likely that the President believes the Russians have something on him.
...
Ledeneva argued that wealth and power are distributed through networks of political figures and businesspeople who follow unspoken rules, in an informal hierarchy that she calls the sistema, or system in English. Sistema has a few clear rules—do not defy Putin being the most obvious one—and a toolkit for controlling potentially errant members. It is primarily a system of ambiguity.
...
The scenario that, to my mind, makes the most sense of the given facts and requires the fewest fantastical leaps is that, a decade or so ago, Trump, naïve, covetous, and struggling for cash, may have laundered money for a business partner from the former Soviet Union or engaged in some other financial crime.
...
Trump and many of his defenders have declared his businesses, including those in the former Soviet Union, to be off-limits to the Mueller investigation.