If you knew a foreign entity/government had this working it might be prudent to publish a "we have it too", even if it didn't work. Then it's just a matter of

If you knew a foreign entity/government had this working it might be prudent to publish a "we have it too", even if it didn't work. Then it's just a matter of stealing the tech and letting Lockheed, etc. produce it for your nation state so that you are not held hostage. Something this big, if not released to the public as generic technology could potentially start wars.