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This comment only makes sense if you disregard entirely detection by satellite image.
You did say radar... Anyway, good look snapping a picture of a ~20m jet travelling almost at mach1 from at least 500km away with a camera that is on a fixed orbit so you dont control where it is at a particular time. (and even if you did unless you took a picture of it during take off, that also wouldnt tell you where it was flying from.)
???
https://www.planet.com/pulse/aircraft-detection-at-planetary-scale
Notice how those are on the ground, at a known location (an airbase), so a photo can be planned for in advance.
They are decidedly not fast jets travelling on an attack mission at close to the speed of sound.