Ukraine said Sunday it had evidence that Russia was behind a massive cyberattack that knocked out key government websites this past week, as Microsoft warned the hack could be far worse than first thought.

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Kyiv on Friday reported a massive cyber attack on key government websites as tensions between Russia and the West over Ukraine escalate following several rounds of unsuccessful talks.

The education ministry said on Facebook that its website was down due to a "global (cyber) attack" that had taken place overnight.

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