Comment by walrus01

Presumably it's also known to everyone who builds/operates these that having a foreign nation's military satellite intentionally approach your own geostationary satellite to within a very short distance, as the vast area up there goes, is a very thinly veiled threat or demonstration of capability.

https://www.google.com/search?client=firefox-b-d&q=russian+s...

Outside of GEO, nobody in the public really knows what the X-37 does when it's in orbit, but one of the theories I have seen thrown around is that it's capable of approaching and inspecting other things in LEO, or theoretically even grabbing or manipulating one in some way.