“We will install loudspeakers against North Korea today and carry out the broadcast,” the president’s office said in a statement.

It added that “the responsibility for the escalation of tension between the two Koreas will be entirely up to the North.”

North Korea sent more than 300 trash-filled balloons across the border in a fresh blitz starting on Saturday, Seoul’s military said, with the president’s office saying this had forced it to take “corresponding measures”.

“Although the measures we are taking may be difficult for the North Korean regime to endure, they will deliver messages of light and hope to the North Korean military and citizens,” it added.

In recent weeks, activists in the South have floated dozens of balloons bearing K-pop, dollar bills, and anti-Kim Jong-un propaganda northwards, infuriating Pyongyang which has retaliated in kind.

Pyongyang sent nearly a thousand balloons carrying cigarette butts and toilet paper across the border in late May and early June, before calling off its campaign.