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Russia is believed to have hacked US satellite communications provider Viasat on the day of its invasion of Ukraine. Western intelligence agencies have been investigating the incident and while they have not yet made a public accusation, they believe Russia was behind it. It appears to be the most significant cyber-attack linked to the conflict so far, affecting military, as well as government, communications. Overall though, Western officials say Ukraine has proved more resilient to cyber-attacks than many had expected.