The Ring was merely an extension of Sauron's will, power, and malice. Even though it was sentient, it had no free will of its own. At the most, it could want to come back to Sauron, but I definitely don't think it could turn against him.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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