It's also pretty clearly Russia's style. Islamic terrorists would have targeted people, not random infrastructure, and Russian operatives have already been caught trying such things, or after having done such things all over Europe.
I'd be very interested to see how France responds. Nuking Moscow would of course be too much, but this sort of escalation cannot be left unchecked because as we've well seen, Putin is a fucking idiot who needs to get his head kicked in or he'll just keep pushing. More Mirages for Ukraine? This list getting longer? https://www.defense.gouv.fr/en/news/french-military-equipmen... A ban on anyone receiving Russian money from French politics (bye bye Le Pen and other Quislings)?
A couple of reports (grain of salt needed):
An FSB operative caught bragging about sabotaging the Olympics in Bulgaria: https://x.com/michaeldweiss/status/1816431778615226742
Russian arrested in Paris over sabotage plot: https://www.bbc.com/news/articles/cd1j7kg2nk0o
A bunch of FSB operatives caught in Ukraine: https://global.espreso.tv/russia-ukraine-war-fsb-agents-plan...
Previous reporting from Bellingcat on Russian operations: https://www.bellingcat.com/news/uk-and-europe/2021/04/26/how...