Specifically on cable attacks, it could be simply due to 5G hysteria though, especially that it already happened multiple times: https://www.wired.co.uk/article/france-paris-internet-cable-... (Apr. 2022), https://reporterre.net/Exclusif-la-carte-des-sabotages-des-a... (Dec. 2021, before the Russia-Ukraine war). I'm not clearing Russian agents or pro-Russian sympathies cutting off the cables (maybe the 5G hysteria is the cover), but this is a plausible explanation that makes sense.