That, argues Paik Hak Soon, a researcher at the Sejong Institute, a Seoul think tank, means that there is "no other way but to return to the six-party talks for the nuclear issue."

首尔智囊团世宗研究院的研究员白学顺认为，现在除了继续进行有关核问题的六方会谈外，别无它法。

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"If South Koreans don't go to work at Kaesong, North Korea will suffer" financially, said analyst Hong Hyun-ik at the private Sejong Institute in South Korea.

NPR: SKorea, US Begin Drills As NKorea Threatens War

"North Korea wants to get the U.S. to direct bilateral negotiations by using the missile card, " said Paik Hak-soon, a North Korea expert at the Seoul-based Sejong Institute.

NPR: Bush Calls for Unity, Condemns North Korean Tests