Transformers are not very hard to replace or make though. All they are is some copper wound around iron. It will just be some added frustration and annoyance for them but no gamechanger. If they start doing it a lot Russia will just build a bigger electrical workforce and more backstock. They have plenty of people and the authorianism to make them do whatever they want. It's just a pissing contest. Russia did lots of cyberattacks on the Ukrainian electrical network in the years before the invasion. Didn't do anything either but send a message.
I would compare it to the Natanz cyber attack which reportedly cost a fortune and caused lots of business losses around the world. It only set the Iranian uranium refinement back a few percent.
Then Obama comes and talks to them, strikes a deal. That solved the issue entirely and cost much less. Of course then Trump comes and messes it all up again but that's another story.
Russia is importing shells from North Korea. Transformers are more complex than you give them credit for, and Russia has a very limited ability to manufacture anything, it would make a difference.
I would compare it to the Natanz cyber attack which reportedly cost a fortune and caused lots of business losses around the world. It only set the Iranian uranium refinement back a few percent.
Then Obama comes and talks to them, strikes a deal. That solved the issue entirely and cost much less. Of course then Trump comes and messes it all up again but that's another story.