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North Korean leader Kim Jong Un has dismissed his uncle — who was considered the number two power in the country — from a key defense post. Jang Song Thaek was accused of a long list of criminal and counter-revolutionary acts. He was stripped of all power, and was seen on state television being forcibly removed from a party meeting. Melissa Block talks with Korea-watcher Victor Cha, a senior advisor at the Center for Strategic and International Studies.