Jim, I stand corrected - if we are to believe Defence Minister Marles:

"‘No quid pro quo’: Defence Minister Richard Marles rejects idea subs deal means we go to war if US does"

https://thenewdaily.com.au/news/politics/australian-politics/2023/03/19/us-subs-marles-war/

at least someone in Canberra has a spine :-)