[reitanqild]

> Why would it have been Russia? Obviously we don't know who did,

Agree. As mentioned above I keep multiple options open.

> but my thoughts were that Russia would want that pipeline to be available as a bargaining chip to get the rest of Europe to pressure Ukraine to concede. How does blowing it up benefit them?

Exactly as I outlined above: if they did it, it is (relatively) cheap power signaling: “think if this happened to one of the cables that are in use. We are actually dumb & crazy enough & technically capable to pull it off”.