President Joe Biden has told President Vladimir Putin the US will take "any necessary action" to stop cyber-attacks from Russia, the White House says.
A reporter asked Mr Biden after the hour-long phone call if Russia would face consequences, and he said: "Yes."
But Moscow denied US claims they had contacted the Russians repeatedly about the cyber-attacks in the past month.
Friday's call between Mr Putin and Mr Biden follows their meeting last month in Geneva.
It also comes amid an increase in attacks, including one that disabled 1,500 companies this month.
"I made it very clear to him that the United States expects when a ransomware operation is coming from his soil, even though it's not sponsored by the state, we expect them to act if we give them enough information to act on who that is," Mr Biden told media after the phone call.
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