Earlier quoted context omitted.
> The only beneficiary of the pipeline going bust are the USA. Ukraine and Norway are also beneficiaries. Ukraine because it reduces the risk of Germany getting squishy about supporting them and Norway because they’ve cornered the European natural gas market.
But ukraine is unable to do it by themselves, and norway probably to. On the other hand, USA (biden) literally said that they will stop the nord streams on tv.
They're pretty good at improvisation. Odds are good that they could pull off such a thing if they were so inclined. You don't need a traditional submarine fleet to do something like this.
They're not at the top of my suspects list though.