South Korea will begin loudspeaker broadcasts directed at North Korea on Sunday, its National Security Council said, after Pyongyang resumed sending balloons carrying trash across the border.
The Council met on Sunday morning, after dozens of balloons with trash attached were found in Seoul and in areas near the border earlier in the day and overnight.
"The measures we will take may be unbearable for the North Korean regime but they will send a message of hope and light to the North's troops and its people," the Council said.
South Korea has warned it would take "unendurable" measures against the North for sending the trash balloons, which could include blaring propaganda broadcasts from huge loudspeakers set up at the border directed at the North.
Pyongyang started sending balloons carrying trash and manure across the border in May and has said the move was in retaliation to anti-North leaflets flown by South Korean activists as part of a propaganda campaign.
On June 2, it said it would temporarily halt sending the balloons because 15 tons of trash it sent was probably enough to get the message across on how "unpleasant" it was. However, it vowed to resume if leaflets are again flown from the South by sending hundred times the amount.
A group of South Korean activists defied the warning and have since flown more balloons to the North with leaflets criticising its leader Kim Jong Un together with USB sticks containing K-pop videos and dramas, and U.S. dollar notes.
South Korea stopped the broadcasts under an agreement signed by the two Korea's leaders in 2018 declaring a new era of peace and harmony and vowing to ease military tensions to eliminate the chances of another war breaking out.
But tensions have mounted since then as North Korea pushed ahead with the development of ballistic missiles and declared it sees South Korea as its "enemy number one", unveiling a range of weapons that it said were aimed at the South.
South Korea's broadcasts are blasted from multiple speakers stacked in large racks and include world news and information about democratic and capitalist society with a mix of popular K-pop music. The sound is believed to travel more than 20 kilometres (12.4 miles) into North Korea.
South Korea's military said the North launched about 330 balloons with trash attached starting Saturday and about 80 of them dropped in South Korea.

US, India agree on trade deal and lower tariffs, says Trump
Israel reopens Gaza's Rafah border crossing to Egypt, with limits
US envoy Witkoff to visit Israel, meet Netanyahu, Israeli officials say
Russian drone strike kills 12 miners in Ukraine
Singapore to launch space agency in response to global investment surge
Five-year-old boy returns to Minnesota after ICE release
Reopening of Gaza's Rafah crossing expected Monday
Winter storm death toll in United States reaches 90
