Communist Party School professor and North Korea expert Zhang Liangui tells China News Service that South Korea's bigger role in the routine US-South Korean military exercises may have provoked Pyongyang.

BBC: China media: Tension over North Korea

"A safe flight orbit has been chosen so that carrier rocket debris to be generated during the flight would not have any impact on neighboring countries, " Korea Central News Agency, the North's state-run news service, said Friday.

WSJ: U.S. Warns North Korea Over Rocket Launch

Another attractive telecommunications company in Korea is KT Corporation (nyse: KTC - news - people ), South Korea's largest landline phone service.

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