According to another U.S. intelligence official, “They find these guys driving around in circles in Kansas. It’s a pretty aggressive effort.”

It’s a trend that has led intelligence officials to conclude the Kremlin is waging a quiet effort to map the United States’ telecommunications infrastructure, perhaps preparing for an opportunity to disrupt it.

“Half the time they’re never confronted,” the official, who declined to be identified discussing intelligence matters, said of the incidents. “We assume they’re mapping our infrastructure.”

As the country — and Washington in particular — borders on near-obsession over whether affiliates of Donald Trump’s campaign colluded with the Kremlin to swing the 2016 presidential election, U.S. intelligence officials say Moscow’s espionage ground game is growing stronger and more brazen than ever.