WASHINGTON — Defense Secretary Pete Hegseth has paused offensive cyberoperations against Russia by U.S. Cyber Command, rolling back some efforts to contend with a key adversary even as national security experts call for the U.S. to expand those capabilities.

A U.S. official, speaking on condition of anonymity to discuss sensitive operations, on Monday confirmed the pause.

Hegseth’s decision does not affect cyberoperations conducted by other agencies, including the CIA and the Cybersecurity and Infrastructure Security Agency. But the Trump administration also has rolled back other efforts at the FBI and other agencies related to countering digital and cyber threats.

The Pentagon decision, which was first reported by The Record, comes as many national security and cybersecurity experts have urged greater investments in cyber defense and offense, particularly as China and Russia have sought to interfere with the nation’s economy, elections and security.

Republican lawmakers and national security experts have all called for a greater offensive posture. During his Senate confirmation hearing this year, CIA Director John Ratcliffe said America’s rivals have shown that they believe cyberespionage — retrieving sensitive information and disrupting American business and infrastructure — to be an essential weapon of the modern arsenal.

“I want us to have all of the tools necessary to go on offense against our adversaries in the cyber community,” Ratcliffe said.

Cyber Command oversees and coordinates the Pentagon’s cybersecurity work and is known as America’s first line of defense in cyberspace. It also plans offensive cyberoperations for potential use against adversaries.

Hegseth’s directive arrived before Friday’s dustup between President Donald Trump and Ukrainian President Volodymyr Zelenskyy in the Oval Office. It wasn’t clear if the pause was tied to any negotiating tactic by the Trump administration to push Moscow into a peace deal with Ukraine.

Trump has vowed to end the war that began when Russia invaded Ukraine three years ago, and on Monday he slammed Zelenskyy for suggesting the end to the conflict was “far away.”