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This undated picture released from North Korea's official Korean Central News Agency (KCNA) on August 25, 2016 shows a test-fire of strategic submarine-launched ballistic missile being launched at an undisclosed location. / AFP / KCNA / KNS / South Korea OUT / REPUBLIC OF KOREA OUT  / SOUTH 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 KNS/AFP/Getty Images)
This undated picture released from North Korea's official Korean Central News Agency (KCNA) on August 25, 2016 shows a test-fire of strategic submarine-launched ballistic missile being launched at an undisclosed location. / AFP / KCNA / KNS / South Korea OUT / REPUBLIC OF KOREA OUT  / SOUTH 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 KNS/AFP/Getty Images)

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Experts: North Korea missile program advancing

As President Trump gets ready for critical talks with China's leader, North Korea test-fires another missile. CNN's Brian Todd reports.

Experts: North Korea missile program advancing

As President Trump gets ready for critical talks with China's leader, North Korea test-fires another missile. CNN's Brian Todd reports.