Who is Kim Jong Un?
CNN's Paula Hancocks looks at how the North Korean leader's strategy changed from testing missiles to meeting world leaders.
01:51 - Source: CNN
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Who is Kim Jong Un?
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South Korean President Moon Jae-in exchanges documents with North Korean leader Kim Jong Un during a signing ceremony at Paekhwawon State Guesthouse on Sept. 19, 2018 in Pyongyang, North Korea. Kim and Moon meet for the Inter-Korean summit talks after the 1945 division of the peninsula, and will discuss ways to denuclearize the Korean Peninsula.
Watch: Key moments from North and South Korea summit
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North Korean leader Kim Jong Un, left, and South Korean President Moon Jae-in raise their hands after signing on a joint statement at the border village of Panmunjom in the Demilitarized Zone, South Korea, Friday, April 27, 2018. (Korea Summit Press Pool via AP)
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This picture from North Korea's official Korean Central News Agency (KCNA) taken on March 27, 2018 and released on March 28, 2018 shows China's President Xi Jinping (R) shaking hands with North Korean leader Kim Jong Un in Beijing.
North Korean leader Kim Jong Un was treated to a lavish welcome by Chinese President Xi Jinping during a secretive trip to Beijing as both sides seek to repair frayed ties ahead of landmark summits with Seoul and Washington.  / AFP PHOTO / KCNA VIA KNS / - / South Korea OUT / REPUBLIC OF KOREA OUT   ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO/KCNA VIA KNS" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS
THIS PICTURE WAS MADE AVAILABLE BY A THIRD PARTY. AFP CAN NOT INDEPENDENTLY VERIFY THE AUTHENTICITY, LOCATION, DATE AND CONTENT OF THIS IMAGE. THIS PHOTO IS DISTRIBUTED EXACTLY AS RECEIVED BY AFP.  /         (Photo credit should read -/AFP/Getty Images)
How close are China and North Korea?
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PANMUNJOM, SOUTH KOREA - SEPTEMBER 29:  (SOUTH KOREA OUT)  In this handout photo from Chosun Daily News, a North Korean Soldier (R) looks at South Korean soldier at the border village of Panmunjom between North and South Korea on September 29, 2010 in Panmunjom, South Korea. The two Koreas plan to hold military talks in Panmunjom in an attempt to ease tensions between the countries. The mooted talks come in the wake of speculation over the succession of leader Kim Jong-il by his son Kim Jongun. (Photo by Lee Tae-Kyung/Getty Images)
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PYEONGCHANG-GUN, SOUTH KOREA - FEBRUARY 09:  (EDITORS NOTE: Alternate crop of #916122914) Kim Yo Jong, sister of North Korean leader Kim Jong Un, arrives at the opening ceremony of the PyeongChang 2018 Winter Olympic Games at PyeongChang Olympic Stadium on February 9, 2018 in Pyeongchang-gun, South Korea.  (Photo by Patrick Semansky - Pool /Getty Images)
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PANMUNJOM, SOUTH KOREA - APRIL 27:  North Korean Leader Kim Jong Un (L) and South Korean President Moon Jae-in (R) shake hands over the military demarcation line upon meeting for the Inter-Korean Summit on April 27, 2018 in Panmunjom, South Korea. Kim and Moon meet at the border today for the third-ever inter-Korean summit talks after the 1945 division of the peninsula, and first since 2007 between then President Roh Moo-hyun of South Korea and Leader Kim Jong-il of North Korea.  (Photo by Korea Summit Press Pool/Getty Images)
The moment Kim Jong Un crossed to the South
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