Yeah, I thought of that and you're right, the speed-differential is still probably too big (though in the video in the link I posted, you can see the Russian fighter is flying high AOA, implying lower speed) for human-controlled f**kery. I think proximity-fuse is the best little nasty surprise.
Another thing that just popped in my head: chaff- or flare-dispensers linked to tail-warning radar. "Gosh, we thought it was a missile coming at us, so we started spoofing! Sorry 'bout your bad luck."