Before their split: North Korean leader Kim Jong Un, right, and his uncle, Jang Song Thaek, in February 2012. Earlier this month, Jang was executed. Kyodo/Landov hide caption

itoggle caption Kyodo/Landov

Jang Song Thaek, who was North Korea's second-most powerful official, was put to death this week. Kyodo/Landov hide caption

itoggle caption Kyodo/Landov

A still image taken from North Korea's state-run television footage and released Monday shows Jang Song Thaek being forcibly removed by uniformed personnel from a meeting of the Central Committee of the Workers' Party of Korea in Pyongyang. Yonhap/Reuters/Landov hide caption

itoggle caption Yonhap/Reuters/Landov

A still image taken from North Korea's state-run television footage and released Monday shows Jang Song Thaek being forcibly removed by uniformed personnel from a meeting of the Central Committee of the Workers' Party of Korea in Pyongyang. Yonhap/Reuters/Landov hide caption

itoggle caption Yonhap/Reuters/Landov

In a photo from July, North Korean leader Kim Jong Un (second left) is flanked by top advisers, including his uncle Jang Song Thaek, at far right in white uniform. Wong Maye-E/AP hide caption

itoggle caption Wong Maye-E/AP

Park Boo Seo (right), a former member of the Korean Kuwol partisan unit, speaks about Merrill Newman, an American tourist detained in North Korea. Newman supervised the group during the Korean War. Ahn Young-joon/AP hide caption

itoggle caption Ahn Young-joon/AP

This photo taken on Nov. 9 and released on Nov. 30 by North Korea's official Korean Central News Agency shows American Merrill Newman inking his thumbprint onto a written apology for his alleged crimes both as a tourist and during his participation in the Korean War. KCNA/AFP/Getty Images hide caption

itoggle caption KCNA/AFP/Getty Images

North Korean soldiers march through Kim Il-Sung square in Pyongyang. Merrill Newman, an American grandfather, has been missing since being removed from a plane about to depart North Korea on Oct. 26. ED JONES/AFP/Getty Images hide caption

itoggle caption ED JONES/AFP/Getty Images

An Aug. 31 image from DigitalGlobe shows the 5-megawatt reactor at North Korea's Yongbyon facility. South Korean officials say they have confirmed that the nuclear reactor has been restarted. DigitalGlobe/ScapeWare3d/via Getty Images hide caption

itoggle caption DigitalGlobe/ScapeWare3d/via Getty Images

South Korean Cho Jang-geum, 81, weeps as she fills out an application to reunite with family members who live in North Korea, at the headquarters of the Korean Red Cross in Seoul Saturday. North Korea announced today that it is indefinitely postponing the reunions of families who were separated by the 1950-53 Korean War. The meetings were to take place in the coming week. Park Dong-ju/AP hide caption

itoggle caption Park Dong-ju/AP