North Korea's fourth underground nuclear test last week set off more than seismic tremors that reached the northeastern Chinese border.
A test of what U.S. intelligence believes was a partial blast of a developmental thermonuclear bomb has sharpened political differences between China and its fraternal communist ally.
For the first time since North Korea began nuclear testing 10 years ago, Pyongyang failed to notify Chinese leaders in advance of the Dec. 6 test, catching China by surprise and prompting a harsher than usual response from Beijing.
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