They would use it when defeat is imminent or likely a bit sooner.
What if they get nuked first and they did not see it coming?
Then it will be too late
They wont get nuked first unless they nuke themselves and seeing as this conflict was likely engineered to bring down iran and the ayatollah so that israel doesn't have to fear loose shia nukes, it's unlikely they'll do that at this juncture, maybe in 5 to 10 years if they need another crack at the egg.
Oh iran or some other sworn enemy just may surprise them
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