[BHSPitMonkey]

> Or build a couple dozen and put in a lower orbit. Not like it would make a dent in China or Russias military budget, or require any tech newer than 20 years old for them.

Look at this animation[1] for a moment (click the >> or >>> button to speed up) and think about what it would actually take to get "in front" of enough satellites to block out a given geographic region; even just a single city. There are hundreds of satellites in each orbital plane, rapidly cycling through and taking each others' place.

You obviously cannot have counter-satellites in a geosynchronous "position", and you also can't have satellites simply move between greatly different orbits (or phases of existing orbits) willy nilly; The delta-V requirements are just too great. This just isn't a feasible strategy.

[1] https://heavens-above.com/Starlink.aspx