While the frantic diplomacy continues, South Korea is using an unlikely weapon against North Korea - the Korean pop music known as K-pop.
The world of K-pop is a big export in Asia and worth nearly $5 billion a year to South Korea.
It is also an unlikely weapon against North Korea - South Korea blasts the music across the border so people know what they are missing out on.
The music, along with the internet, is banned in North Korea, where citizens are said to live of a diet of government propaganda.
South Koreans are even going to the lengths of hiding USB sticks in bottles full of rice, thrown in a river floating toward the north, so people can have a taste of life outside of the borders of North Korea.
Watch the video for the full CBS News report.