I suspect this happens all the time and that we do it right back. This is kinda like submarines pinging each other or Russian fighter jets approaching a US carrier.
Exactly, and it's nothing new, to wit,
From the 22nd paragraph of the article:
"The United States sometimes does the same thing. It bored deeply into Irans infrastructure before the 2015 nuclear accord, placing digital implants in systems that would enable it to bring down power grids, command-and-control systems and other infrastructure in case a conflict broke out. The operation was code-named Nitro Zeus, and its revelation made clear that getting into the critical infrastructure of adversaries is now a standard element of preparing for possible conflict."
What is new is the laughable pretense that the Russians initiated this activity against the US.