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People watch a TV news program showing North Korea's announcement, at the Seoul Railway Station in Seoul, South Korea, Wednesday, Jan. 6, 2016. North Korea said Wednesday it had conducted a hydrogen bomb test, a defiant and surprising move that, if confirmed, would put Pyongyang a big step closer toward improving its still-limited nuclear arsenal. The letters read " Will not use nuclear weapon if autonomy secured."  (AP Photo/Ahn Young-joon)
People watch a TV news program showing North Korea's announcement, at the Seoul Railway Station in Seoul, South Korea, Wednesday, Jan. 6, 2016. North Korea said Wednesday it had conducted a hydrogen bomb test, a defiant and surprising move that, if confirmed, would put Pyongyang a big step closer toward improving its still-limited nuclear arsenal. The letters read " Will not use nuclear weapon if autonomy secured."  (AP Photo/Ahn Young-joon)

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    China rattled by North Korean Hydrogen bomb test

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China rattled by North Korean Hydrogen bomb test

Despite its strong ties to North Korea, China "firmly opposes" Pyongyang's possible H-bomb test. CNN's Will Ripley reports.

China rattled by North Korean Hydrogen bomb test

Despite its strong ties to North Korea, China "firmly opposes" Pyongyang's possible H-bomb test. CNN's Will Ripley reports.