A photo released Monday by the Rodong Sinmun, newspaper of the ruling Workers' Party, shows North Korean leader Kim Jong Un walking with a cane as he visits a residential area in Pyongyang. Rodong Sinmun/EPA/LANDOV hide caption

itoggle caption Rodong Sinmun/EPA/LANDOV

Balloons launched by North Korean defectors carry anti-Pyonyang propaganda along with U.S. dollar notes and DVDs into North Korea near the demilitarized zone. Kim Chul-soo/EPA/Landov hide caption

itoggle caption Kim Chul-soo/EPA/Landov

North Korea's National Defense Commission Vice Chairman Hwang Pyong So, middle, waves as the country's athletes march at the end of the Asian Games. He's flanked by Workers Party Secretary Choe Ryong Hae, right, and South Korea's Kim Kwan-jin, left, national security adviser to South Korea's president. Dita Alangkara/AP hide caption

itoggle caption Dita Alangkara/AP

People watch a TV news program showing North Korean leader Kim Jong Un, right, and Kim's uncle, Jang Song Thaek, circled in red, at the Seoul Railway Station in South Korea on Dec. 3. Ahn Young-joon/AP hide caption

itoggle caption Ahn Young-joon/AP

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

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

Former basketball star Dennis Rodman at Beijing Capital International Airport on Tuesday, before his flight to Pyongyang, North Korea. Petar Kujundzic /Reuters /Landov hide caption

itoggle caption Petar Kujundzic /Reuters /Landov