The attack, which started in Ukraine and Russia before spreading globally, affected thousands of computers, particularly affecting multinational companies and critical infrastructure. The Kremlin has denied involvement.
"In June 2017, the Russian military launched the most destructive and costly cyber attack in history," the White House said in a tersely worded statement.
"The attack, dubbed 'NotPetya,' quickly spread worldwide, causing billions of dollars in damage across Europe, Asia, and the Americas. It was part of the Kremlin's ongoing effort to destabilize Ukraine," it said.
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