To be honest, I am not sure what sovereign means at this point. For example it seems most European countries are just lapdogs of US interests. Which was especially clear when US bombed to German pipeline and Germany acts like nothing has happened.
Biden even stated this in a press conference with Olaf Schulz standing next beside him [0], but again there were more US officials making similar statements.
You can wait for “official” proof, while I am sure US officials weren’t making practical jokes.
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Recall that this is a press conference essentially announcing that Germany agreed NordStream 2 will not open if Russia openly invades Ukraine, that Biden is (by this time) sitting on very reliable evidence saying that Russia is planning to imminently openly invade Ukraine, and the reporter is asking "okay, what if Russia doesn't openly invade Ukraine?", whereupon the answer is effectively "that's not gonna happen."
They stated what, specifically? That they would literally bomb the pipeline?
You need to be at least a little more careful with these cognitive distortions you're pushing. Remember, in order for them to work - they need to be at least logically plausible, and in some way grounded in believable, every day reality.