In this March 2, 2019, file photo, Kim Yo Jong, sister of North Korea's leader Kim Jong Un attends a wreath-laying ceremony at Ho Chi Minh Mausoleum in Hanoi, Vietnam. North Korea has threatened to end an inter-Korean military agreement reached in 2018 to reduce tensions if the South fails to prevent activists from flying anti-Pyongyang leaflets over the border. The powerful sister said Thursday, June 4, 2020, the North could permanently shut a liaison office with the South and an inter-Korean factory park in the border town of Kaesong, which have been major symbols of reconciliation between the rivals. (Jorge Silva/Pool Photo via AP, File) **FILE**
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