Also the aspect that it reminds the whole of NATO how fragile their infrastruture is for the upcoming winter. It doesn't matter how big your navy is I can get 4x deep dive special forces in a recreational boat and freeze everyone to death. I think the first explosions were actually when they opened the Poland-Norway gas line.
Same goes for intercontinental undersea communication cables. You would probably take out most of the world's finance/trading systems for weeks/months by destroying a handful of transcontinental cables.
It's a power display for fear abroad and for getting all the potential dissidents back in line.
I am very curious if this keeps escalating at what point is a NATO member gonna claim that article 5 has been breached.
I thought about it, too. But even this hypothesis has a weak point: the Yamal pipeline is still working well. So this is a moot point: if the generals or whoever decide to kill Putin and takeover, they will be able to resume sending the gas through Yamal immediately.
So Putin would benefit in that situation.