Ukraine says has 'evidence' Russia behind cyberattack

Ukraine claims it has evidence that a recent massive cyberattack that knocked out key government websites was initiated by Russia, further straining tensions. — REUTERS/File Photo

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.

Tensions are at an all-time high between Ukraine and Russia, which Kyiv accuses of having massed troops on its border ahead of a possible invasion.