Kim Jong-Un Isn't the First Dictator to Go Missing

He learned the move from his father, the Dear Leader.

— -- This isn't the first time that Kim Jong-un has gone missing but the North Korean leader is breaking his own record by staying out of the public eye for this long.

"He may also be facing personal challenges -- he does have a family -- a wife and at least one child. Perhaps there is illness or some other problem. Again, who knows?" Moon said.

North Korea expert Michael Madden, who runs a leadership watch blog and contributes to Johns Hopkins University's Korean Studies site, told ABC News that there were two other times that he has gone missing since taking control of the country following his father's death in December 2011.

"There's no reason to really think it was his health back then," Madden said. "He was more muscular than he is now."

The second absence came in April 2013, though he was only out of the public eye for about two weeks immediately after a rather turbulent political period, so it may have been a strategic move on the part of his advisers.

Former Venezuelan President Hugo Chavez remained out of sight for more than two months while he recovered from his fourth cancer-related surgery in December 2012, according to the Associated Press.

When Kim Jong-il is believed to have had his stroke in 2008, North Korean press officials did their best to prevent any admission of ill health. Madden said that officials claimed Kim Jong-il attended two public events during his roughly 80-day absence, though there were no photos taken at one event and the images released from the second were believed to be doctored.

One factor that makes Kim Jong-un's ongoing absence different from the rest of the dictatorial pack is his age. Though his health is clearly a cause for concern -- since he has grown noticeably larger and was seen limping in his last public appearance -- his age makes the prospect of a grave medical issue less of a concern.

Each time Fidel Castro is not seen for long periods, which occurs regularly, a fresh crop of death rumors begins to circulate. One of the longest stretches came last year, when, at 87, he wasn't seen for eight months and, according to the Associated Press, that stretch was broken on Jan. 8 when he attended a gallery opening in Havana.

Kim Jong-un acknowledged his absence from Friday's celebration of the national party's anniversary by sending flowers that were placed in front of statues of his father and grandfather.

"I'm going to give Kim Jong-un until Monday to show up," Madden said.