has started a 'hybrid war', it was feared tonight, as several key Ukrainian websites, including banks, government departments and the ministry of defence, were hit by a massive cyber attack. has been under constant attack from Russian and Kremlin-backed hackers since Moscow's 2014 annexation of Crimea.Cyber espionage, damage to databases and servers, disruption to power and communications and disinformation are all now routine weapons in the Russian armoury.
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