Well, people think EMP pulse, we do EW jammers that are directional and overload specific frequencies in the spectrum. Probably enough to smoke circuits. And I'm thinking that we are way ahead of the Bear when it comes to EW. As in the ship fire up the SLQ-32 and cease to exist as far as the Fencer is concerned.
Back in the Cold War when a Soviet pilot defected to Japan with his then-modern MiG-25 Foxbat he reported that the plane's radar (electronics were basically vacuum tubes [in the 1980s!!!]) was, while not sophisticated, very powerful -- enough to burn through a lot of ECM. During takeoff the plane was known to microwave small animals like rabbits to death that were in front of the plane; a Russian general who was something of an animal lover ordered that the radar not be turned on until the plane was airborne in order to preserve the rabbits.
I don't know how this would effect other aircraft; presumably they'd be far away and the radar pulse by then wouldn't be dangerous. It wasn't dangerous to the Foxbat's electronics though and they were a lot closer, though of course the radar was directional and pointed forward from the nose.
However airborne radar can be pretty nasty if the Foxbat is any evidence ...
doubt it could shut down a U.S. Navy vessels electronics though ....