My best guess as to Russian interest is that by performing the sabotage in a difficult-to-attribute manner it plants the seeds for anti-US (and by extent, anti-Ukraine) sentiment in the public perception in the EU. More or less the governments of EU countries need the will of the people to back military aid to Ukraine, so giving the public something to latch on to from an anti-US perspective is valuable in that it could lower or prevent aid.
The Russians can also probably be secure in knowing that NATO won't publicly identify Russia as responsible as that would probably mean war and it has been very clear that NATO's top priority is avoiding the spread of the war in Ukraine.
There are some other possible Russian motivations I've seen, but put less stock in like capability demonstration and limiting incentives for a coup.
The Russians can also probably be secure in knowing that NATO won't publicly identify Russia as responsible as that would probably mean war and it has been very clear that NATO's top priority is avoiding the spread of the war in Ukraine.
There are some other possible Russian motivations I've seen, but put less stock in like capability demonstration and limiting incentives for a coup.