We now know the quid pro quo.
Trump wanted to dump US sanctions on Russia so he could build a tower (or towers) in Moscow.
Putin would get a $50m apartment. Russia would be free of US restrictions. Trump would make a fortune. Trust in the US would plummet.
Someone is the loser in that deal. Who could it be that Trump sold down the river?
Oh yes. His country. The one he says he puts first.