Mjolnir vs GL Ring (Tug of War)
Let's assume that there is an unbreakable Adamantium strand interwoven with Uru, Promethhium, Vibranium and also strengthened by mystical energy attached to the GL ring and Mjolnir as the line. Now the Ring is attempting to find a new host, while Mjolnir is attempting to return to Thor.
Which one gets pulled?
Before anyone suggests it, the line reinforces the strap on Mjolnir.