In this photo provided by the North Korean government, North Korean leader Kim Jong Un, center, attends a plenary meeting of the Workers’ Party in Pyongyang, North Korea, Wednesday, Aug. 19, 2020. North Korea has decided to hold a rare ruling party congress in January where leader Kim will announce a new five-year plan to develop the country’s dismal economy ravaged by U.S.-led sanctions and a global pandemic, state media said Thursday, Aug. 20, 2020. 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 language watermark on image as provided by source reads: "KCNA" which is the abbreviation for Korean Central News Agency. (Korean Central News Agency/Korea News Service via AP)

FILE - In this Sept. 19, 2018, file photo, Kim Yo Jong, right, helps her brother North Korean leader Kim Jong Un sign a joint statement following the summit with South Korean President Moon Jae-in at the Paekhwawon State Guesthouse in Pyongyang, North Korea. In a closed-door briefing to South Korean lawmakers on Thursday, Aug. 20, 2020, Seoul's spy agency said the stress of managing state affairs caused Kim to recently delegate some of his powers to a select group of senior officials, including his sister Kim Yo Jong, who is now chiefly involved in shaping policies toward Washington and Seoul. (Pyongyang Press Corps Pool via AP, File)

In this photo provided by the North Korean government, North Korean leader Kim Jong Un speaks during a plenary meeting of the Workers’ Party in Pyongyang, North Korea, Wednesday, Aug. 19, 2020. North Korea has decided to hold a rare ruling party congress in January where leader Kim will announce a new five-year plan to develop the country’s dismal economy ravaged by U.S.-led sanctions and a global pandemic, state media said Thursday, Aug. 20, 2020. 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)

In this photo provided by the North Korean government, North Korean leader Kim Jong Un, center, speaks during a plenary meeting of the Workers’ Party in Pyongyang, North Korea, Wednesday, Aug. 19, 2020. North Korea has decided to hold a rare ruling party congress in January where leader Kim will announce a new five-year plan to develop the country’s dismal economy ravaged by U.S.-led sanctions and a global pandemic, state media said Thursday, Aug. 20, 2020. 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 language watermark on image as provided by source reads: "KCNA" which is the abbreviation for Korean Central News Agency. (Korean Central News Agency/Korea News Service via AP)