https://himawari8.nict.go.jp/
This is what the Earth looks like from a geostationary orbit
This is what the Earth looks like from a geostationary orbit
The image you linked were made by a weather monitoring satelite. It was optimised to capture a wide are of the globe. This is clearly not the type of lens you would use to surveil military activity. It is not even the right modality to capture radar signals.
> A geostationary satellite with a similar resolution is simply not possible to build and launch in this age.
I think I will have to read up on that specifically more. I was aware how far GEO is, but I don't understand what makes the optics impossible. (Clearly it is as you say, all the sources agree with you.) Thank you!