I think it's pretty clear that the NordStream explosion was a joint US-Russia-Ukraine operation.
Clearly NordStream was destroyed in a drunken escapade on a rented yacht.
https://www.wsj.com/world/europe/nord-stream-pipeline-explos...
Hell, throw sweden in there too: https://omni.se/marinen-pa-plats-dagarna-fore-explosionerna/...
Not sure about joint, might have been half a dozen sides all independently trying to blow it up at the same time. Only way to settle it will be elevating nordstream blowup to an Olympic competition. Will it be summer Olympics (because water) or winter Olympics (because gas supply is so much more exciting in winter)?