* Hitmen 'planning to kill' Kim Jong-un have been arrested, it is claimed * They were reportedly arrested near Tumen River at the border with China * North Korean guards who detained them were apparently rewarded * One suspect is said to be a defector and at least one is a Chinese national ___________________________________________ Hitmen who were planning to assassinate North Korean leader Kim Jong-un have been detained, according to reports. At least two people - one of whom is believed to be a North Korean defector, and at least one Chinese national - were arrested near Tumen River at...