For seventeen days in 1958, Soviet scientists toured Britain while a coalition of atomic and technical spies tracked their every move—notes that remain stripped of their technical core.
Kept secret for decades, a system of codenames for enemy electronics was paired with river-crossing maps, preparing for a war that would have turned Eastern Europe into a graveyard.
Boris Yeltsin told Bill Clinton a nuclear weapon hit the Kamchatka Peninsula during a drill, while admitting he once handed off nuclear control to a prime minister during surgery.