Mark Lowcock, the U.N. aid chief, returned to Beijing from Pyongyang on Thursday, after looking into what is believed to be a precarious food situation in North Korea due in part to natural disasters.During his four-day visit from Monday, the U.N. undersecretary general of humanitarian affairs and emergency relief coordinator met with North Korea's ceremonial head of state Kim Yong Nam and public health minister Jang Jun Sang.His arrival at Beijing International Airport was confirmed by Kyodo News.It marked the first time since 2011 that an U.N. aid chief has visited North Korea.Lowcock sai…READ FULL ARTICLE