By James Pearson NEWPORT, Wales (Reuters) -Russia was behind a massive cyberattack against a satellite internet network which took tens of thousands of modems offline at the onset of Russia-Ukraine war, the United States, Britain, Canada, Estonia and the European Union said on Tuesday. The digital assault against Viasat’s KA-SAT network in late February took place just as Russian armour pushed into Ukraine. U.S. Secretary of State Antony Blinken said the cyberattack was intended “to disrupt Ukrainian command and control during the invasion, and those actions had spillover impacts into other Eu…