trump is a Russian/Putin asset.
His status alone explains most of his actions.
Fill in the blank: trump's decision helps Putin by_________________________________.
Then the question becomes this: What does Putin want?
It's harder to answer that question.
I find it easier to understand Putin when I imagine a rat in a tenement.
This rat will try to steal all the food he can find, shit wherever he is, run from threats until cornered and, when cornered, will fight with all his might.
Unfortunately for us, this rat has nuclear weapons, good energy reserves and about 140 million people he considers as slaves.
Putin wants Western Democracies to wither and die. So he directs trump to foster division, violence and corruption in the United States and other Democracies.