It would need targeting systems and launch systems. There has to be a method for a launch and acceleratiom prior to allowing gravity to take hold. Reagan looked to SDI as the ultimate in defense agaist ICBMs. I do not think he saw space as a location for offensive weapons. Treaties have been signed and ratified outlawing such weapons. The Soviets/ Russians have enough sophistication to locate any launch platforms and would certainly develop ways to target them or at least reveal their existence.
Its not high tech, but it is physics. It used to be treaties as well, but I think the treaties may be null and void at this point.
I don’t think ‘Star Wars’ was about anything most folks think it was about. I don’t know if ‘Rods from God’ were deployed or not. If they were deployed, they are still very old tech in terms of the timelines of such stuff.