[icegreentea2]

Yes, it's a totally different category from SRBMs - so maybe the US's ability to deliver tactical nuclear weapons more than 10-100km into highly contested airspace is poorer, but given your original scenario (battlefield use and tit for tat vs Russia), I don't see this being a significant limitation?

As it stands today, I have no reason to believe that American aircraft (F-35 and B-2 both carry B-61) cannot conduct operations over the forward areas of Russian ground forces.

Ukraine has been able to use GMLRS and, launch cruise missile strikes into Russian held territory success. Ukraine believes that ATACMS will be viable. I don't believe the current evidence indicates that Russian IADS are capable of sufficiently deflecting/deterring an American air strike.