I do not think the Russians will build a weapon like this. If they nail one satellite, a chain reaction of the debris will wipe out everything around it, then those pieces will do the same, infinitum. A paint chip took out a French satellite as it was moving at 18,000 m.p.h. And, come to find out, it was from one of their own boosters. Every time we have launched, we have added more junk the Air Force tracks, tons of it. Then you have dead satellites, some with small nuclear reactors to power them. When a satellite in the Clark belt is at its end of life, they use station keeping fuel to boost them to a higher orbit, more junk, tons of it, in space.
If aliens do come, they will not be able to make it through the debris.
As Pogo (I date myself) would say, "I have seen the enemy and he is us!".