(Bloomberg) -- The U.S. is stepping up digital incursions into Russia’s electric power grid in a warning to President Vladimir Putin, the New York Times reported, citing current and former government officials.

While the U.S. has probed the Russian grid since at least 2012 and there’s no evidence it has turned off power, the Trump administration’s strategy has shifted more toward offense with the deployment of U.S. computer code inside the grid and other targets, the newspaper said. The effort has gotten far more aggressive over the past year, the Times quoted an unidentified senior intelligence official as saying.

The U.S. is taking a broader view “to say to Russia, or anybody else that’s engaged in cyberoperations against us, ‘You will pay a price,”’ U.S. National Security Adviser John Bolton said at a public event on Tuesday, according to the report.

To contact the reporter on this story: Hailey Waller in New York at hwaller@bloomberg.net

To contact the editors responsible for this story: James Ludden at jludden@bloomberg.net, Tony Czuczka, Matthew G. Miller

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