As U.S. hardens line on North Korea, South may pay

SEOUL (Reuters) - Washington's decision to fly B-52 and stealth bomber missions over Korea this week in a warning to Pyongyang risks pushing the North into staging an attack on the South just as its threats may have been on the cusp of dying down.

New leaders in Seoul, Beijing and most importantly, an untested 30-year-old in Pyongyang who has to prove he is capable of facing down a perceived threat from the United States, have raised the stakes in a month-long standoff that risks flaring into a conflict.