Even better life in prison for all on board. (This is extreme but I bet you that they'd think twice)
That's not extreme. They destroyed a piece of expensive critical infrastructure. Prison and seizure should be the bare minimum. I just mean it's not enough to prevent it in the future.
> life in prison for all on board
Honestly, give any Russian or shadow-vessel crew a bounty if they surrender. Turn Moscow’s fleet into a cheap source of intelligence and scrap.