Computer systems from Russia to the United States were struck on Tuesday in an international cyberattack that bore similarities to a recent assault that crippled tens of thousands of machines worldwide. As reports of the attack spread quickly, the Ukrainian government said that several of its ministries, radiation monitoring at the Chernobyl nuclear facility, local banks and metro systems had been affected. A number of companies — including the Danish shipping giant

Maersk; Rosneft, the Russian energy giant; Saint-Gobain, the French construction materials company; and WPP, the British advertising agency — also said they had been targeted. And in the first confirmed cases in the United States, Merck, the drug giant, confirmed that its global computer networks had been hit, as did DLA Piper, the multinational law firm. READ MORE