Why North Korea regime is scary

Updated 9:22 AM EDT, Fri March 29, 2013

Story highlights

Scott Snyder: Kim Jong Un ratchets up threats toward South Korea and U.S. to record level

Snyder: Bluff, followed by "charm offensive," is typical strategy but Kim gets closer to brink

We don't know what Kim is trying to prove, Snyder says, or what political events drive him

Snyder: South Korea and U.S. are tired of chest-thumping and it's not working anymore