I’m not concerned. Wen they can make airplane-to-airplane missiles is when we need to take notice.
Those Russkis really know how to pick names. Mig-31BM!!! (AKA the Flying Crapper?) Vimpel (rhymes with pimple)!!
Technologically none were as big a threat as we initially thought but still we had to go though a learning curve to counter the technology. We were saved by the much maligned military industrial complex in this country then. Now we are dismantling it so fast, we may not be saved again.