Not to mention, they have to trust that they're actually telling the truth because it's basically an ICBM with a satellite as a payload (instead of an explosive

Not to mention, they have to trust that they're actually telling the truth because it's basically an ICBM with a satellite as a payload (instead of an explosive weapon). Heck, it could still be both. Since it's a hostile party launching it, they have to treat it as if it's a weapon before it even launches (such as warning they'll shoot it down if it's in their airspace).