no one owns space, but you have to launch a rocket from somewhere, and most countries have limits on what you can launch and who you have to coordinate your orbit with.
There are various treaties restricting putting weapons in space, but generally if you have enough money, you can put whatever you want in space as long as you have an End of Life plan so your satellite doesnt just become space debris in an orbit someone else might want to use.
If you personally want to put up a small satellite in a decaying orbit, you can do so for only 100K or so with a CubeSat rideshare
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