FILE - In this April 13, 2017 file photo, North Korean leader Kim Jong Un, center, is accompanied by Pak Pong Ju, right, Hwang Pyong So, second left, as he arrives for the official opening of the Ryomyong residential area, in Pyongyang, North Korea. Pyongyang will seek the extradition of anyone involved in what it says was a CIA-backed plot to kill leader Kim Jung Un April, 2017, with a biochemical poison, a top North Korean foreign ministry official said Thursday, May 11, 2017.(AP Photo/Wong Maye-E, File)