(Bloomberg) — Holed up in the Estonian city of Tartu, where the Soviet Union once housed a fleet of bombers, NATO officials are testing the alliance's ability to defend against cyber-threats by rogue states and terrorists.

One simulation put to participants in the week-long exercise that continues Friday involves an Internet attack that would paralyze military commanders' radar screens, making them unable to see oncoming missiles or aircraft. Another envisages an attack on a general's tablet computer that resulted in the posting of sensitive information online. 

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