This editorial in the WSJ points out that president Trump's and the Iranian government's response in the firing of missiles at a U.S. airbase in Iraq were intended to quiet things down so that there was no escalation. Both sides were in effect standing down which president Trump called a good thing.
Beyond deterrence the U.S. effort is also to work with its European allies to open a path to renegotiating the 2015 Iran nuclear deal so that a long term settlement can be reached for the region.
Original article 3 minutes, gist 1 minute