On Wednesday night lines of monster missiles rolled through the North Korean capital Pyongang. But it was not just his weapons that Kim Jong-un was parading. On show too, was his daughter. As the North Korean leader took up his usual parade position, at the centre of the balcony, he was joined, unusually, by the young girl dressed in black. She is thought to be his second oldest child, called Kim Ju-ae, aged around 10 years of age. This is the fifth public appearance she has made, and all in less than three months. During this short time she has...