Stephen Trimble is reporting that the Pentagon is concerned that its current generation of EW gear will not be able to cope with later models of Russian SAMs.
The S-300 and S-400 systems (SA-12, 20, 21, 23) have the potential even the existing ALQ-99, which is carried by dedicated jammers, the EA6B Prowler and F/A-18G Growler.
I’m not sure how much this is Pentagon budget sucking, and how much is real needs myself.
He also posted a neat Youtube (it’s about an hour long) on the history of electronic warfare in the Silicon Valley: