Biden stated last year: "If Russia invades [Ukraine] there will be no longer a Nord Stream 2. We will bring an end to it." [1] This was a clear threat, clear as day, that the US could destroy Nordstream. It should surprise nobody that the US was involved.
Since Nordstream was destroyed amidst public pressure from US energy companies who wanted to takeover the European energy market, the US has become the world's leading exporter of liquid natural gas, Europeans are paying record natural gas prices, and US energy companies are reporting record profits. Again, the relationship between these things should surprise nobody.
1: https://www.washingtonpost.com/politics/2022/02/08/bidens-bi...