And who said that this war is not a US/Russian proxy...

And who said that this war is not a US/Russian proxy war?

Remember the issue in this war is whether the Ukraine ought
to have the right to join NATO (its not about the Ukraine joining the USA.)

NB quote from your post above:

"A Polish official said the US told Russia it would strike Russiantargets in Ukraine if Putin used a nuke."

Let me do a Pauline Hansen explanation here:

The threat is that the USA would bomb Russia if Russia....... ...not a NATO threat to bomb Russia!