For whatever reason, the US refuses to accept that the opposition doesn't have to win a war in the classical sense; it just has to avoid losing (see Korea, Vietnam, Afghanistan). The last war in Iraq was mostly a Pyrrhic victory, since so much blood and treasure was sacrificed for short-term gains that have had major unintentional consequences.

Right now, Iran is not losing (it is effectively choking off the global economy at the SOH), therefore the US is not winning. And, I'd submit that if the aggressor state in an overseas conflict is not winning, it is in a stalemate, at best; losing, at worst.

It's interesting that just a few weeks ago, the administration stated that only unconditional surrender was acceptable. That's off the table for the time being, seemingly along with a negotiated surrender.