North Korean military moves: What can the U.S. do?

Updated 4:28 PM EDT, Thu May 5, 2016
This undated picture released from North Korea's official Korean Central News Agency (KCNA) on January 12, 2014 shows North Korean leader Kim Jong-Un (front L) inspecting the command of Korean People's Army (KPA) Unit 534.    AFP PHOTO / KCNA via KNS    REPUBLIC OF KOREA OUT   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    ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / KCNA VIA KNS" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS        (Photo credit should read KNS/AFP/Getty Images)
AFP/Getty Images
This undated picture released from North Korea's official Korean Central News Agency (KCNA) on January 12, 2014 shows North Korean leader Kim Jong-Un (front L) inspecting the command of Korean People's Army (KPA) Unit 534. AFP PHOTO / KCNA via KNS REPUBLIC OF KOREA OUT 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 ---EDITORS NOTE--- RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / KCNA VIA KNS" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS (Photo credit should read KNS/AFP/Getty Images)
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SINGAPORE - JUNE 12: In this handout photo, North Korean leader Kim Jong-un shakes hands with U.S. President Donald Trump during their historic U.S.-DPRK summit at the Capella Hotel on Sentosa island on June 12, 2018 in Singapore. U.S. President Trump and North Korean leader Kim Jong-un held the historic meeting between leaders of both countries on Tuesday morning in Singapore, carrying hopes to end decades of hostility and the threat of North Korea's nuclear program. (Photo by Kevin Lim/THE STRAITS TIMES/Handout/Getty Images)
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Story highlights

U.S. military leaders are closely watching the latest North Korean provocations

This is how the U.S. works to keep the lid on the North Korean threat

(CNN) —  

North Korea is marking its first top-level party congress since 1980 at a time of increased military aggression on the part of Pyongyang, alarming its neighbors and Western countries.

North Korea’s behavior, which includes missile and nuclear tests and imprisoning Americans, has led to levels of tension in Asia unprecedented in modern memory, according to Pentagon officials.

RELATED: North Korea launches two midrange missiles, but both fail

Since North Korean leader Kim Jong Un assumed power in 2011, he has shown a penchant for brute force. He’s secured his hold on power by having about 70 senior officials killed – including one of his uncles. And he’s steadily raised regional tensions with rocket launches, missile firings, cyber attacks, nuclear tests and – North Korea claims – a hydrogen bomb test, an assertion U.S. officials dispute.