部分差异在于地理：车臣位于令俄罗斯倍感头疼的高加索边缘，这使它更容易受到外国极端主义的影响。

Part of the difference is geography: Chechnya is on Russia's fraying Caucasian edge, which made it more susceptible to foreign extremism.

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核心国和边缘国之间的经济差异是个问题吗？

Is the difference between core and periphery a problem?

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法国和德国已经从衰退泥潭中全身而退；意大利和西班牙还处在水深火热中。核心国和边缘国之间的经济差异是个问题吗？

France and Germany have emerged from recession; Italy and Spain are still struggling. Is the difference between core and periphery a problem?

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