They wouldn't if it were a sub. And US ASW choppers could very well have been chasing a Russian sub.
Sure they were chasing a sub in shallow water. Have you ever been to the Baltic Sea? Denmark? A sub can’t hide there, it’s shallow. And.......There is nothing to be gained by the Russians blowing up their own pipeline, something that is a major source of income for them. No, there is only one person/actor/nation that wants to push Russia into total submission, and that is Biden and the US. And they do it for the world bank and to protect the US Dollar. And the proxy war with Russia in Ukraine isn’t going as fast as they want it to. So the US upped the game, pissed off Europe and now are trying to blame Russia. Europe is going to sue us into oblivion once it is exposed we did this to them