The US is already rebuilding many of its warheads. The process is ongoing but is estimated to take 30 years or so and cost about $1tn. It will presumably not re

The US is already rebuilding many of its warheads. The process is ongoing but is estimated to take 30 years or so and cost about $1tn. It will presumably not require actual weapons tests, just component tests and simulations. I would assume that other nuclear-armed nations are doing the same things, if they have the financial resources (not all of them necessarily do.) https://en.m.wikipedia.org/wiki/Renovation_of_the_nuclear_weapon_arsenal_of_the_United_States https://en.m.wikipedia.org/wiki/Renovation_of_the_nuclear_we...