No, actually, Trump’s actions were entirely appropriate and to be expected when one of the parties throws a wrench into the works. In this case, it was likely a case of the Nork generals perceiving some weakness on the president’s part due to the Cohen testimony and some trepidation that Kim might be getting a little too cozy with Trump. Trump says, “OK, we’re done” and the Norks look at one another with the “WTF, That didn’t go well” look.
With respect to the first point, the Dems pulled a Vietnam on the president.
I have strong areas of disagreement with this kid at times - but this is pretty good analysis: https://youtu.be/1ZktbPoQxo4