North Korea warned South Korea Thursday that a failure to stop anti-DPRK leaflets being flown into the country will ruin “hard-won” improvements in relations, following the visit of a high-level delegation to Seoul on Saturday.

The comments came from the Secretariat of the Committee for the Peaceful Reunification of Korea (CPRK), which issued a bulletin on a planned leaflet launch by the “Alliance for the Movement of Free North”, set for this Friday.

“This operation projected by the disgusting human scum is no more than the last-ditch effort to chill the hard-won atmosphere of improving the north-south relations,” the bulletin