North Korea has been scattering propaganda leaflets into South Korea almost daily since the operation began early last week, the Defense Ministry said Monday.

"Since the first related news report, the North Korean military is spreading leaflets on almost a daily basis," ministry spokesman Kim Min-seok said in a regular briefing.

The accumulated number of North Korean leaflets that have arrived in South Korea is reaching about 1 million and many of them have been collected, Kim noted.

North Korea was first reported on Jan. 13 to have started the leaflet operation the night before. The leaflets criticized President Park Geun-hye for Seoul's loudspeaker broadcasts intended for the North.

The South started to blare messages critical of North Korean leader Kim Jong-un and also played bouncy K-pop songs along the inter-Korean border toward North Korea in retaliation for Pyongyang's nuclear test on Jan. 2.

"We resumed the anti-North loudspeaker broadcasts ... because North Korea's fourth nuclear test institutes a provocation to the whole globe," Kim noted in response to the North Korean foreign ministry's criticism of the broadcast operation last week.

Currently, part of Seoul and areas north of Seoul have been subject so far to the North Korean leaflet campaign, Kim said. (Yonhap)