FILE - In this March 4, 2021, file photo provided by the North Korean government, North Korean leader Kim Jong Un delivers a speech during a workshop of chief secretaries of city and county committees of the ruling Workers' Party in Pyongyang, North Korea. State media say Kim vowed to launch an “uncompromising struggle” against anti-socialist elements and build a perfect self-supporting economy. Kim's comments released Thursday, May 27, 2021 come as he seeks greater internal strength to overcome pandemic-related difficulties and U.S.-led sanctions. Independent journalists were not given access to cover the event depicted in this image distributed by the North Korean government. The content of this image is as provided and cannot be independently verified. (Korean Central News Agency/Korea News Service via AP, File)

FILE - In this March 26, 2021, file photo, commuters watch a TV showing file imagea of North Korean leader Kim Jong Un and U.S. President Joe Biden during a news program at the Suseo Railway Station in Seoul, South Korea. State media say Kim vowed to launch an “uncompromising struggle” against anti-socialist elements and build a perfect self-supporting economy. Kim's comments released Thursday, May 27, 2021 come as he seeks greater internal strength to overcome pandemic-related difficulties and U.S.-led sanctions. (AP Photo/Ahn Young-joon, File)

FILE - In this May 21, 2021, file photo, U.S. President Joe Biden listens as South Korean President Moon Jae-in speaks during a joint news conference in the East Room of the White House in Washington. State media say North Korean leader Kim Jong Un vowed to launch an “uncompromising struggle” against anti-socialist elements and build a perfect self-supporting economy. Kim's comments released Thursday, May 27, 2021 come as he seeks greater internal strength to overcome pandemic-related difficulties and U.S.-led sanctions. (AP Photo/Alex Brandon, File)