When it comes to countering shaheds, Ukraine is years ahead of pretty much everyone right now.
Iran has been mass producing them for years too, they can make hundreds a month and they could make hundreds more in a sustained war situation.
The US has very few options besides pulling outta there quickly that will allow them to call it a victory.
If Russia decides to play ball and feed intel to Iran then those salvos and shahed swarms are gonna start landing on aircraft carriers like flies on a turd.
Most facilities are deep underground, hard to reach for most bombs except those carried by big bombers that are expensive to operate and a logistical nightmare in contested airspace, which Iran is at the moment.
The shaheds are also tiny, cheap and are built mostly from readily available components. As we've seen in Ukraine there are literally hundreds of designs, some made literally with cardboard, with new iterations seemingly every day.
Traditional air defense systems can be very easily overwhelmed by sheer number of incoming drones. Combine those with ballistic weapons and the mix is pretty much unstoppable with current means.