The Russian Federal Security Service spokesman said he had no immediate information about Russian authorities contacting the FBI.

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Five days later, FBI asked the Russian Federal Security Service, known as the FSB, for more information and received no response, one U.S. official said.

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All the more interesting therefore that the Russian Federal Security Service (FSB) has recently been co-operating with the Federal Bureau of Investigation (FBI) in arresting the alleged perpetrators of the December 2008 RBS WorldPay data breach.

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The ministry said Russia's Foreign Ministry, the Federal Security Service and the Defense Ministry were alerted to the attack, and the Russian government established contact with rescue centers in nearby Seychelles and Kenya.

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