when did the north korean nuclear program start
Timeline of the North Korean nuclear program The North Korean nuclear program can roughly be divided into four phases. Phase I (1956–80) dealt primarily with training and gaining basic knowledge. Phase II (1980–94) covers the growth and eventual suspension of North Korea's domestic plutonium production program. Phase III (1994–2002) covers the period of the "freeze" on North Korea's plutonium program (though North Korea pursued uranium enrichment in secret)[2] and Phase IV (2002–present) covers the current period of renewed nuclear activities.[3]