With Elves all but gone from Middle Earth and the might of Numenor long past there is not anything like the forces to face him as there was in his defeat when he lost the Ring so not likely he would be forced to join in the battle himself.The Nine would be far more powerful once he regained the Ring (so it says in FoTR).He is not a Valar btw he is a Maiar but i am sure you knew this.Simple fact is there is no armies left to stand up to him.
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He who arises in Might.
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