Trump has always been about bluster. He's currently "blustering" at the entire world. In his mind, he's setting expectations and trying to put other countries on their toes/sow chaos to "improve his negotiating position." In reality, his behavior is depressingly predictable even when the specific content is not, and no one is going to take the bait.
I also think part of this is focusing the American public on big manufactured controversies that have no chance of ever actually happening to keep them distracted from the awful things that are going to be coming out daily very soon.