Stephen Bosworth, the diplomat President Barack Obama appointed to the thankless task of trying to persuade North Korea to give up its nuclear-weapons program, got quite a reception when he arrived on his first official visit to Seoul this week. The North Korean government in Pyongyang shut down the last military communication line between the two countries on the divided peninsula, temporarily halted all transit to and from a special industrial zone just north of the border and declared that if the U.S
