Nikita V. Petrov, a historian of Russian security services, said Moscow agreed to the deal "to save face" after the embarrassment of the arrests.

俄罗斯安全服务历史学家Nikita v . Petrov表示：莫斯科之所以同意这项交换是为了挽回在此事件中丢掉的脸面。

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The Russian security services say they've foiled a plot to carry out an attack on Moscow, killing two of the three suspects. From Moscow, here's Daniel Sandford.

俄罗斯安全部门称捣毁了企图在莫斯科制造袭击事件的阴谋，并杀死三名嫌犯中的两个。丹尼尔·桑福德在莫斯科报道。

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While head of BP-TNK, a joint venture in Russia, he fell out with BP's Russian partners and left the country in some disarray after the Russian security services raided BP's office in Moscow.

他曾任英国石油和俄罗斯的合资企业秋明石油公司的首席执行官，不料和俄方合作伙伴产生分歧，俄罗斯安全机构查抄英国石油驻莫斯科分部后，他仓皇逃离俄罗斯。

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In July, on Mr Putin's orders, Russian security services also won official permission to hunt terrorists abroad.

ECONOMIST: Russian poisonings

State-run media also posted a series of photos released by Russian security services that purportedly showed Mr. Fogle's detention.

WSJ: Russia to Expel U.S. Diplomat

An unnamed official told the AP news agency that US investigators were working with the Russian security services, the FSB.

BBC: Boston bombs: Memorial for slain officer Sean Collier