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Officials Say Russian Hackers May Retaliate for Sanctions

U.S. officials and security specialists are warning that Russian hackers may respond to new sanctions by attacking the computer networks of U.S. banks and other companies.

U.S. officials involved in a White House review of the effects of further penalties on Russia didn’t respond to questions about whether the study explores the risk of cyber-counterattacks. Even so, two people with knowledge of the review said it includes revisiting previous classified exercises in which small numbers of computer experts showed they were able to cripple the U.S. economy in a few days.