[Farael]

What you guys are forgetting is that the will of the Ring is the will of his Master... and Sauron is the only true Master of the One Ring. Even if someone else mastered it and managed to defeat Sauron, the ring would ultimately corrupt them into another Dark Lord... thus, it's still the will of Sauron at work, just not Sauron himself doing it.

So, to answer the question and as nafforc said, the ring IS Sauron... but from my perspective, it's not a matter of who controls whom.... as they are the same thing.