I’m anything but an expert, but disabling a pipeline on a seabed sounds a bit too technical and requiring a bit of operational prowess that the Ruskies have never really displayed. Beyond that, why would they blow up two pipelines when all they have to do is turn the damn valve off?
They have been working on their seafloor sabotage capabilities for a while now. Severing internet cables in particular. Placing explosives on a gas line they built is absolutely possible. Not saying they did do it, but it's within their skill set . And ours, to be fair. Maybe others too.
