Hmmmm... A dinky sword in a backhanded defeated swipe severs the fingers (and hence gets the ring away from) of Sauron...
So-
Sauron has ring, Sauron directs his armies and takes over Middle-Earth, Sauron gets out there in the fray from time to time just for some multiple people bashing fun.
Sauron raises his sword triumphantly---
And a blaster cannon beam with the diameter of Topeka, Kansas hits him, incinerating everything but the ring.
Cut to Vadar killing another Admiral for missing the good guy's armies.
Now if the ring grants powers along the lines of what the wearer already has (i.e. gandalf would be a more powerful gandalf, bilbo didn't have much to multiply), what would happen if Vadar put on the ring?