North Korea, Russia and China watch on as crisis unfolds in key US ally South Korea

A night of political upheaval in South Korea has upended stability in a key democratic US ally – sending shock waves through the region and Washington at a moment of acute global tension.

​ A night of political upheaval in South Korea has upended stability in a key democratic US ally – sending shock waves through the region and Washington at a moment of acute global tension. Read More Breaking News, Latest News and Videos | CNN