Everyone seems to know it was Russia and is just casting out ideas to find a plausible motivation. I find that completely baffling. For opportunity, consider that while setting up the pipeline needs a weird high-pressure residence and special training, blowing it up takes a fishing boat, scuba gear and underwater explosives. The equipment and training is cheap and available. So, those with opportunity is almost anyon…
Your arguments are valid but what baffles me in this topic is why folks try so hard to find completely rational explanations for russian actions now. People with hurt egos do stupid things all the time. Look at the clusterf*k that is Ukraine, how they keep doing stupid things that hurt them on and on.