We have multiple European States blaming Russia and really this actually is retaliation over German military equipment getting sent to Ukraine and don't forget recently the German tanks were blocked from getting transferred to Ukrainian forces. However we have seen Putin threatening to cut off all the gas and what I think is the biggest indicator is the fact that this pipeline is heavily dependent on not only German funding but also German Workers and German control.
I think there are bigger powers in play and Russia is pushing Germany and Germany ended up trying to say no and this is retaliation.
Having Russian warships in that area recently as well as forensic evidence might show us what's going on however. The biggest issue that I see is the fact that this entire event has been buried in the news and there's not that much going on around the investigation.
So the best I can guess is that eventually the truth is going to come out with us going over the forensic evidence.