Eyebrows might be raised by PEOTUS Donald Trump's phone call with Taiwanese leader President Tsai Ing-wen because it suggests either a break with current US foreign policy or a lack of knowledge of it (or, maybe, just self-interest). It's really hard to say, isn't it?
And that's the problem. This is, after all, a person whose advisers assured Japanese officials that they should not take things Trump says in public literally. It leaves you with very little idea how to take him, at all. So when he speaks with leaders in Pakistan or Kazakhstan, there is a certain alarm...
How do leaders around the world decide to "take" what he says, publically and privately? I guess one thing they could do is keep an eye on Trump's business interests and finagle accordingly. (There is no trust so blind as one the entire business-pages reading world can see.) How does Trump "take" what they say, in turn? Who knows?
This is not how any of this is supposed to work.