He has no idea how US foreign policy works. Or any US policy really. Because he frankly doesn't care. People who try to inform him have talked about how difficult it is to get him to pay attention, that it requires cutting it very short and throwing lots of colorful pictures. It's not a secret in Washington. You say he's a political obsessive but he pays more attention to various fox news rants (which are often conspiratorial) then to well sourced briefings.

He's smart at scams and self promotion, anything else he's intellectually lazy about.

He cares a lot about influence at least while he's in charge but he undervalues or ignores soft power and just tries to bully allies.