Preceded by the launch of a "tactical nuclear attack submarine," North Korean Leader Kim Jong Un attended a paramilitary parade with his daughter this September to mark the 75th anniversary of the country's founding. Since taking over from his father in 2011, how firm is Kim Jong Un's grip on power, and how should the US and its Asian allies respond to his accelerating nuclear program? Former US National Intelligence Officer for North Korea, Sydney Seiler, offers his opinion.