The crash site itself could also yield more clues, according to Stratfor military analyst Sim Tack, speaking via Skype.

坠机地点本身就能提供很多线索，美国战略预测公司的军事分析员西姆·塔克通过Skype说。

The key thing to watch, says Rodger Baker, Stratfor Vice President of Strategic Analysis, is whether or not China feels North Korea's actions are starting to undermine Beijing's interests.

美国政策咨询公司Stratfor的战略分析业务副总裁罗杰说，现在要观察的主要方面就是中国是否认为朝鲜的做法开始损害到中国的利益了。