Syria and North Korea. Trump rattles his saber and expects his opponents to back down.
That trick never works. The only way to win a war is to fight it; posturing does not lead to victory.
But it can start wars. Diplomats answer threats with threats and the verbal conflicts escalate until, finally, all parties can see no other choices but to fight. Add to that the brutal treatment of immigrants and refugees under the Trump administration, the trade policies of the Trump administration, and the diplomatic incompetence of the Trump administration. The USA is making many enemies. So I think some of the talk will eventually turn to action. It may be in some place we don't expect; Yemen is a festering conflict, Ukraine is very much at risk. (Not at all coincidentally, both centers of the global fossil energy business.)
It seems likely to me that President Trump will get his war.