And also the cable between Lithuania and Sweden:
https://www.theguardian.com/world/2024/nov/18/telecoms-cable...
replies(2):
https://www.theguardian.com/world/2024/nov/18/telecoms-cable...
https://www.theguardian.com/world/2024/nov/16/russian-spy-sh...
Any build up on those borders is now going to be interpreted in that way and you'll have a likely reaction from NATO all across the eastern front.
I doubt they would get very far.