As I mentioned this, or other variants I've seen being posted in twitter, with Russia doing this does not compute.
A kilometer wide gas bubble on surface indicates substantial damage. I think it safe to assume that sea water in pipe further damages an additional length of pipeline. German government (or any future one with surprise ala Italy) no longer has the option of giving in to economic and social pressures and making up with Russia before this winter. That option is gone. Russia would be monumentally stupid to lose that option. That was a negotiation card! This is what NS going bye bye means.
Someone mentioned elsewhere that this is the response to the referendums that RF just held. This somehow sounds right.
Generally don't like to be pessimistic, but this action (whoever did it does not matter, unless some random terror group) indicates that whoever did it has already determined that there will be war. [The real thing not the far away affair on social media] They know this but they are not going to announce it to us until absolutely necessary. There is no way there can be global peace after powers start destroying infrastructure at this level. There will be a contest of strength (we're past the will part) after which pipelines and satellites will once again be safe.
p.s. in case it is not clear, I've changed my opinion a bit in this reply. "Risks" may not be relevant because it is understood (and this action was basically a turn in the game with an escalation) that there is going to be, has to be, a showdown. There will be war.