True but ships and crews with the equipment to do the repairs are limited. It's possible to overwhelm the repair capacities. Also, it takes time to physically travel between cuts so while cuts in the Baltic might take a week or two to fix, a cut in the Atlantic and one in the Baltic may take a week or two just for travel.
They already know. The captain will probably end up in prison for a long time, and company which owns the ship will pay for the deliberate damage. Would be good too if they can crack who from the crew works for Russian saboteurs besides the captain. Unlikely it's just one person.
I’m saying you can terminate cleanly without needing a repeater.
To be clear, I’m saying to terminate each end of the cut cable to a terminating device that continues the flow of light, not just the termination at the beginning/end of the line. Sorry if that wasn’t obvious.