North Korea Threatens To Pull Out Of Summit

Frida Ghitis, a former CNN producer and correspondent, is a world affairs columnist. She is a frequent opinion contributor to CNN and The Washington Post and a columnist for World Politics Review. The opinions expressed in this commentary are her own. (CNN)It should come as no surprise that North Korea has apparently just slammed the breaks on the peace train, which until a few hours ago seemed to be chugging happily along, on its way to a historic meeting between President Donald Trump and North Korean leader Kim Jong Un next month in Singapore.