Earlier this month, a South Korea-based activist group claimed it had sent 20 balloons carrying anti-Pyongyang leaflets and USB sticks containing Korean pop music and music videos across the border.

The South Korean civilian group, led by North Korean defector Park Sang-hak, said it floated 10 balloons tied to 200,000 anti-Pyongyang leaflets, USB sticks with K-pop songs and South Korean ...

in what it claims is retaliation for balloons sent by South Korean activists. These allegedly contained anti-Pyongyang leaflets, alongside food, medicine, money and USB sticks loaded with K-pop ...