It's not a matter of making nice with Trump.
The problem is that you can not trust anything he says.  How do you negotiate with someone who is just as likely to turn around the next day, deny he said anything that he said in the record, and accuse you of being dishonest and terrible?
Dealing with the American government for the next four years is going to require a whole different skill set from traditional diplomacy.  It will be essential to not rely on the Americans to do anything that they say they will, because Trump has the ultimate deciding power and demonstrably disavows any of his surrogates when the mood is upon him. It will also be essential to assume that they will manifest the worst possible behavior.
That way we're not disappointed and not hung out to dry.