My money's on nato or the usa. Western politicians are stupid enough to go along with the idea and America's got a long history of causing chaos internationally.
Russia was pretending to have "technical problems" with those pipelines, and now it conveniently blows up? They are obligated by contract to supply us with gas until 2030. Breaking the contract may lead to financial penalties. Wouldn't it be convenient if those pipelines were to suddenly break for unknown reasons, so you don't have that problem?
You know what would release them from their obligations in the contract? An "act of god", that would make the pipelines unusable.
https://www.reuters.com/business/energy/russias-gazprom-decl...