Whether by design, or by chance, Donald Trump's diplomatic tactics in his second term so far see him start outrageously, bend the other side's fingers back, only to quietly lower or walk back from his demands later.
At what point do world leaders push back, and at what point will President Trump need to make good on these threats?
Director of Research at the US Studies Centre Jared Mondschein spoke to the ABC's The World Today program about these latest developments.