The only one except Russia with an incentive would be Germany, and only for NS2, not NS 1. And even then it‘s far less likely. I think also the way it was don

The only one except Russia with an incentive would be Germany, and only for NS2, not NS 1. And even then it‘s far less likely. I think also the way it was done. Attacks on two pipes for maximum effect and apparently large leaks. Anyone except Russia would have an incentive to make an attack look small and boring, perhaps like a defect.