Jang seems `` not as stable as we thought , '' two analyst says . Some observers warn a provocative move like a missile or nuclear test could follow . Opinion : Kim was married to Jang Song Thaek 's aunt , was vice chairman of the top military body . North Korea state media say North Korea was convicted and executed .
Jang seems `` not as stable as we thought , '' two analyst says . Some observers warn a provocative move like a missile or nuclear test could follow . Kim was married to Jang Song Thaek 's aunt , was vice chairman of the top military body . North Korea state media say North Korea was convicted and executed .