American investigators have concluded a coordinated cyberattack brought down much of Ukraine’s power grid on Dec. 23, leaving 225,000 Ukrainians without power for several hours. The attack, executed over a period of six months, appears to be the first deliberate attempt to shut down a national electrical grid using cyber warfare, according to The New York Times . Although Ukrainian officials blamed the Russians, American investigators have not officially named a suspect. “They could …read more Source:...