Re NK nuke/missile progress, please remember that atomic tech is from 1930s, missile tech from 1940s, and thermonuclear tech from 1950s.
(First atomic bombs, 1945-49; first H-bombs, 1952-55, first ICBMs deployed, 1959-1960, etc.)
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(First atomic bombs, 1945-49; first H-bombs, 1952-55, first ICBMs deployed, 1959-1960, etc.)