The U.S. State Department has reaffirmed that the United States supports inter-Korean cooperation and coordinates with its ally South Korea to ensure such cooperation proceeds in lockstep with progress on denuclearization.

A spokesperson of the department issued the position on Monday in response to a written inquiry from Seoul-based Yonhap News regarding North Korea's recent threats over anti-Pyongyang leaflets sent over the border by North Korean defectors in South Korea.

The department has issued similar statements regarding inter-Korean issues. 

Seoul’s Foreign Ministry said on Sunday that South Korea and the U.S. discussed North Korea issues after its leader Kim Jong-un's sister Kim Yo-jong threatened to scrap the 2018 military accord, taking issue with the leaflet campaigns. 

On Friday, a day after Kim's statement, North Korea's United Front Department said that Kim, who oversees South Korea-related affairs, ordered officials to look into implementing measures she had earlier threatened to take if Seoul did not stop North Korean defectors from sending the leaflets.