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Launch a simple rocket on a ballistic trajectory that impacts the item you want to de-orbit. Only aim it to hit the target on the way back down so that the added momentum pushes them into a lower orbit... Another thought would be to use a gravity tractor concept like the one being proposed for moving asteroids. In this instance the goal would be to send a simple thruster device on a path to "not impact" the object you want to move... only use it as a gravity sling which alters the path of both objects in proportion to their mass. If you choose the path correctly, the target heads into the atmosphere and you have the thruster heading for another target. Work it out to do a grand tour style path so you get the most bang for your thruster fuel buck.