I'm gonna assume he was quite heavily guarded, so I guess I'm sort of morbidly impressed they got to him.
That said, I hope NK is liberated soon, this shit has been left going on for far too long now.
He most definitely was not. This guy is a player around Macau and China. He had a house in China before numerous attempts were made on his life.
Yeah the killing of his uncle by placing him in front of artillery fire shows how unhinged this little shit is. Defections have risen to the point you are even seeing officers of the military defect. Coupled with the US and SK being fed up, food aid down, massive flooding and even China not standing for their shit because THAAD defenses and a renewed US presence screws them up as does a more rejuvenated Japanese and SK military means they are on their last legs. He doesn't have the support like his father and grandfather had.
He didn't put him in front of artillery fire, that was allegedly his Defence Minister. Nor did he feed him to dogs. They're unsubstantiated rumours with very little factual basis.
Defections have plummeted since Kim Jong Un assumed control. The tightening up of security around the Yalu River is the reason for that.
Among the people, professionals and intelligentsia, he has significantly more support than his father. He has the likeness of Kim Il Sung (literally 'Their Sun') and thus people assume he has the makings of a successor. The economy has grown, rice prices have fallen, and Pyongyang is being renovated to appease the bureaucrats.
Officers are defecting now because their free ride of doing absolutely nothing is over. The only reason his father remained in control was due to his coddling up to the military. He invented Songun (military first) primarily to ensure that generals with swathes of troops wouldn't attempt a coup. The rest could rot for all he cared; and they did. Un has pursued aggressive nuclear armament because it ideologically renders foot soldiers and expensive materiel obsolete. He can take younger recruits out of the military and assign them to reformation projects that the country desperately needs. The old fart Generals aren't best amused, and thus may throw a hissy fit. The missile launches and rhetoric have been so widely publicised because it's Un trying to save face.