Jamming is easy though.

Just get a big transmitter, and transmit on the same frequency. If you overpower the signal on the reciever end enough that they can't make out a signal anymore, you've succesfully jammed it. You can fight that in a few ways, with a directional antenna, better signal processing to drown out the noise, better signal redudancy to make the processing easier, etc etc. In the end, it's just basics physics.

Of course, the downside of having a really big long range transmitter (like a jammer or rada) is that it's super easy to shoot a missile at it.

You think a relative technological breakthrough is less likely than the guy who is providing Ukraine with Starlink for free is at the same time telling the Russian how to jam it? So he would make sooner or later public a vulnerability in his own technology (which he sells)? Doesn't male any sense. It's easy and satisfying to think that all evil people plan together evil things all the time, but more often than not the answer is simpler than a cospiracy theory based on feelings.