Quote:
Suicide Junkie said:
If you've got cables connecting to the surface, you can easily use them to nudge it in the right direction and keep it in the right spot.
The point being that with your ring spinning, and a small net inward pull by the cables, the pieces of the ring will drift to a slightly higher orbit and the rubble will diffuse from there.
It will take a lot of energy to deorbit the ring parts. The enemy force might as well glass you with "conventional" weapons designed for the task instead 
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In the sense of decelerating the ring parts so they 'fall' out of orbit, yes that would take a lot of energy directed in just the right way. But if the ring loses its centering on the planet then the ring will simply
collide with the planet at full speed.