Ukraine Hackers Crash NATO Sites

    A man holds a Crimean flag during a pro-Russian rally on the eve of a referendum in Lenin Square in Simferopol, March 15, 2014. Ukraine's acting president Oleksandr Turchynov accused "Kremlin agents" on Saturday of fomenting deadly violence in eastern cities, in one of the most direct and highest-level criticisms aimed by Kiev at President Vladimir Putin. Turchinov has warned of a risk of a Russian invasion of the east following Moscow's occupation of the Crimea peninsula. Crimea on Sunday votes on whether to join Russia or stay with Ukraine. REUTERS/Thomas Peter (UKRAINE - Tags: POLITICS CIVIL UNREST TPX IMAGES OF THE DAY) - RTR3H6UM

    Thomas Peter/Reuters

    In the latest escalation of cyber attacks surrounding Crimea, NATO announced Sunday that several of its websites, including its unclassified email network and the NATO-affiliated cyber security center in Estonia, had been hacked. A Ukrainian hacker group that calls itself Cyber Berkut has claimed responsibility for crashing and disrupting services on multiple NATO websites, but the claim has not been independently confirmed. In recent weeks, Cyber Berkut claimed attacks on Russian websites, but its decision to focus on NATO marks a new turn. A statement released by Cyber Berkut said "We will not allow the presence of NATO in our homeland.” Despite the annoyances caused by the attack, a NATO official told Reuters "It doesn't impede our ability to command and control our forces. At no time was there any risk to our classified networks."

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