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I can't find a link right now, but I recall a discussion where they argue that they can't "repair" the pipeline because the sanctions prevent them from getting hold of the exact spare parts needed.
It's dumb as fuck, but it seems to me that FSB types consider this sort of thing to be the height of brilliance. Recall how their supposed reason to meet with Donald Trump Jr. was to discuss lifting the ban on foreign adoptions. At the time, regulating adoptions was the Russian counter move to the sanctions heaped upon them after the 2014 annexation of Crimea.
Yeah it doesn't make sense for them to sabotage it, when they can just turn off the tap