It's the narcissism again.
He sees the news where they show him talking "tough" (supposedly) about North Korea, and he gets a major hard-on from that.
So like a 13-year child, he continues to talk in this manner to get more attention, but thinks nothing about the consequences of his neurotic words.
The man is very mentally ill !
Trump may articulate these issues at a 3rd grade level and through the medium of his narcissistic brain rage posting on Twitter and attention whoring for the media, but Trump's policies represent large financial and powerful interests within the United States. His Administration does nothing without having an underlying motivation for it - one which is obscured by the Democrats' and media's obsessions over his personal antics. If North Korea is attacked or Venezuela is invaded, it's not simply because Trump threw a tantrum - it was calculated, intentional, and aimed at achieving specific foreign policy objectives that advance particular American financial and power interests.