I suppose the other thing is to note that Trump generally seems to have better relationships with the US's enemies, rather than their allies. At the same time as praising Kim and Xi, and buddying up with Putin, he was utterly dismissive of a longstanding Treaty with Japan, and scornful of them in the process.
So the twin criticisms are this, then: I don't think even Trump knows what his foreign policy will be tomorrow, which makes it hard for allies and enemies alike to have a clue how to interact with the US as long as he is President; but, in as much as it does seem coherent, it generally seems to be more favourable to Russian and Chinese interests than to those of Europe and the West.
I could also mention one of the other main aspects of the latest G20 Summit, which saw 19 of the 20 countries reaffirm their commitments to meeting the Paris targets on Climate Change. The only country which did not was the USA -- and indeed it has been reported that Trump was pushing for Brazil and Turkey, among other countries, to abandon the Paris Agreement too. I don't want to dwell on it in this thread, as it's a separate topic, but it is incredibly frustrating to see.
https://www.ft.com/content/a9096898-9a44-11e9-9c06-a4640c9feebb