Since the birth of nuclear weapons, everyone knows the theory, but the formula? That's the true national treasure, of course alongside centrifuges, pure hard work, nothing technical, busy separating uranium and plutonium, and at leisure, used for whipping cream.
(It's a traditional skill to use centrifuges for whipping cream, centrifuges that can't whip cream can't purify nuclear material. This isn't the answer from 404, but from 504)
"Tsar Plus" formula is something not even to be considered. Chen Fei immediately dismissed the thought. He already obtained the formula for the "Element Annihilation Bomb" which is a tactical ceiling-level killer weapon, so there was no need to be greedy.
So now he could only wait for the consent of the sovereignties. After gathering the authorization, he could obtain the activation key for the two strategic-level nuclear weapons.
