Probably not F-117 stealth, but certainly low observable. Good idea to develop their own, since they cannot rely on Obunga and possibly his follower to back them up.
The Japanese may be announcing they are done fooling around with the old "self defense only" routine.
I think they announced that last week actually
Possibly tactical stealth - it’s possible to generally detect any stealth aircraft with a big enough radio array. But tactical stealth, where you can’t lock munitions onto the enemy and you must close in to use guns when all his weapons lock on to you just fine is seriously demoralizing and a good way to get dead for no return.