Iran is testing the resolve of the U.S. government by ordering the Houthis to attack shipping in the Red Sea. I doubt that the U.S. government under Biden & Co. will pass the test. But if it did pass the test, here’s what would happen:
In response to the attacks, the U.S. would strike Iran directly and with more than token force.
The strike wouldn’t decapitate the Irania regime. But the regime would be placed on notice to cease the attacks or face devastation.
Russia and China would be told — in no uncertain terms — to butt out of a dispute between the West and iran.
That should be the end of it. If it isn’t, all Iranian government and military targets, including “secret” nuclear weapons facility, would be obliterated.
Would Russia and China care to challenge the U.S. after that? I think not.
Will it happen under Biden & Co.? I think not.
Restoring deterrence requires moxie. Where is it to be found? In the Executive Branch? In the military? As you write, "I think not."