I don't think there is a treaty about it. These satellites are in space, not in the air. Around 100km usually is used as the boundary or, more practically, as h

I don't think there is a treaty about it. These satellites are in space, not in the air. Around 100km usually is used as the boundary or, more practically, as high as your anti-aircraft missiles can go. It does not really make sense to claim everything up in a cone from your country to infinity. Multiple countries claiming different planets at different times would be weird. SpaceX got approval to launch these satellites from the FCC.