I think I can sum up the Iran "expedition" from the European perspective as follows:
Week 1: We've won, we don't need any assistance"
Week 2: "We're still winning, we're the greatest"
Week 3: "Send help immediately"
A cynical view might be that assistance in keeping the Straits of Hormuz open is potentially exponentially more dangerous than anything that the US has carried out so far as it's been done entirely from the air and / or with stand-off missiles. So Trump's cunning plan is to put other nations assets and personnel directly into the firing line because any US casualties would seriously lose him support at home. Because after all the "we're winning / we've won" rhetoric, Iran is seemingly still able to fire missiles and drones at complete will and the narrow Straits of Hormuz would easily become a bloodbath.
So the card of "you need to do more, we've always been here for you" to other nations is being played so US assets and personnel are not in the front line and any casualties will not be American. Call us Europeans cynical....but many are much smarter than he seems to think.