Espionage knew TW was developing nukes, CIA informant merely confirmed for US, who had to coerce TW to stop because they knew TW nuclearizing was PRC redline, and TW would eat PRC nuke if it didn't stop. Just like how modern day TW is still thoroughly infiltrated by PRC, and any attempt at nuclearizing would get decapitation striked very hard (PRC ordnance can hit anywhere in TW in ~7m). Functionally TW hasn't been nuclear turnkey capable since PRC got their nukes and launch vehicles