Working with NNSA/OST, I can assure you that the DO NOT have nukes....(pssstt....but probably could go nuclear in <90days if they have to. SKorea...>180 days).
Japan could get an A-bomb ready to go in about a week. An H-Bomb might take a month or two. If we helped—days not weeks. Japan is a modern nation like Germany.
But they didn't say anything about Godzilla!
Former PM Suzuki, in an off-hand comment to a reporter once said, “If on a Monday Japan decides it needs nuclear weapons, by Friday we will have them.”
Many interpreted that as meaning Japan has nuclear weapons but not assembled and not in one location, but ready to be called upon on a short notice....................