LotR -- Book 5 - Chapter 04 - The Siege of Gondor

[Kuruharan]

He truly believes that it will help him defend his city and people; he is about to see the military strength which Mordor can put forwards and it surpasses his worst fears, and Gondor stands no chance against this enemy. He needs that Ring.

I'm not sure I'd put it like that. I think a better way of phrasing it is that he would have preferred to have it in his own hands. His expressed desire it to have it locked away unused somewhere. He only planned to pull it out at the uttermost need (which I think shows that he did not understand it all that well because the uttermost need would probably be just a bit too late).

Of course, I suppose that it is anybody's guess what he really thought, but I thought I would point out his expressed intention.