South Korea seeks U.S. strategic weapons after North's nuclear test

Reuters: North Korea said it successfully tested a powerful nuclear bomb on Wednesday, drawing threats of further sanctions even though the United States and weapons experts voiced doubts the device was as advanced as the isolated nation claimed.

The underground explosion shook the earth so hard that it registered as a seismic event with U.S. earthquake monitors. It put pressure on China to rein in neighboring North Korea.

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