The government is running a ` ` smear campaign '' against its neighbor - North Korean state media . CNN 's Paula Hancocks , Shruti Pant , Jethro Mullen and Bob Kovach contributed to this report . South Korea is scheduled to host a high - profile nuclear security summit . US President Barack Obama will be among more than 50 heads of state at the meeting . He will visit the demilitarized zone between South and North Korea for the first time Sunday .
The government is running a ` ` smear campaign '' against its neighbor - North Korean state media . South Korea is scheduled to host a high - profile nuclear security summit . US President Barack Obama will be among more than 50 heads of state at the meeting . He will visit the demilitarized zone between South and North Korea for the first time Sunday .