[mhermher]

Ukrainians may have been involved, but the US would have been the necessary component, and the UK additionally would have been sufficient.

[MichaelCollins]

Yes, certainly if it was done with a conventional submarine. But it's not impossible that Ukraine found a way to do it independently with a UUV/etc.

[2devnull]

https://www.wired.com/story/nord-stream-pipeline-explosion-d...

Could be submarine but why not divers?

[MichaelCollins]

Certainly a possibility. One advantage of using a submarine is you're less likely to be caught red handed, but that doesn't prove it was done with a submarine.