Three other North Koreans entered the United States consulate in Shenyang during the same week, and another pair got into the Canadian embassy in Beijing.

ECONOMIST: North Korean refugees

And the North Koreans viewed that as giving the United States the right to kick down the doors almost anywhere in North Korea.

NPR: North Korea Dropped From Terror List

But then, for several months, the United States balked at taking them off the terrorism list, and so the North Koreans, in the last couple of weeks, started to rebuild their facilities at Yongbyon.

NPR: North Korea Dropped From Terror List