The Kremlin warned on Tuesday that reported US hacking into Russia's electric power grid could escalate into a cyberwar with the United States, but insisted that it was confident in the system's ability to repel electronic attacks.

Dmitri S. Peskov, President Vladimir Putin's spokesman, also raised concerns that President Donald Trump was reportedly not informed about the effort, which was the subject of a New York Times report that detailed an elaborate system of cybertools deployed by the United States inside Russia's energy system and other targets.

The program, as described by current and former unidentified US officials, would enable

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