The defacement of multiple Ukrainian government websites last week may have been intended as cover for a destructive malware attack that failed to execute or has yet to be unleashed, some security experts warn. The defacements occurred Thursday night and Friday morning - local time in Ukraine - as approximately 100,000 Russian troops remained massed on the country's border. On Saturday, Microsoft reported that it had found multiple attempts to infect Ukrainian government sites with a type of destructive malware it had never seen before, and that the first attack attempts appear to have begun Thursday.   Read more about it here.