Europe is helping Ukraine it its defense against Russia.
Russia has sabotaged a lot of things in multiple EU countries, including Spain.
It's not far fetched to imagine Russia being the root cause of this, or being implicated in some way. Even if they are not, they 100% are watching this closely and learn how they can disrupt power throughout Europe.
I'm not saying Russia did it, just that they could be the cause of this.
Weakening Europe is in their interest, and they already have blatantly done smaller scale sabotage. It wouldn't weaken their position, as you said, Europe is not really interested in taking Russia seriously atm. Sabotages, killings, politician corruption and public disinformation have been common tactics for them for a decade now.
Now that Russia's #1 enemy is under their control, I'm not sure they are afraid to take on Europe more directly.