 According to Kim Yong-hyun, a professor of North Korean studies at Dongguk University in Seoul, and others, the promotion of Kim Yo-jong and others is a sign that "the Kim Jong-un regime has ended its co-existence with the remnants of the previous Kim Jong-il regime by carrying out a generational replacement in the party's key elite posts".On 13 February 2017, Kim Jong-nam, the exiled half-brother of Kim Jong-un, was assassinated with the nerve agent VX while walking through Terminal 2 at Kuala Lumpur International Airport.Jong-un is widely believed to have ordered the assassination.